chore: Switch to release-please and GH actions (#26)

Co-authored-by: Casey Waldren <cwaldren@launchdarkly.com>

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is this a support request?**
+This issue tracker is maintained by LaunchDarkly SDK developers and is intended for feedback on the SDK code. If you're not sure whether the problem you are having is specifically related to the SDK, or to the LaunchDarkly service overall, it may be more appropriate to contact the LaunchDarkly support team; they can help to investigate the problem and will consult the SDK team if necessary. You can submit a support request by going [here](https://support.launchdarkly.com/) and clicking "submit a request", or by emailing support@launchdarkly.com.
+
+Note that issues filed on this issue tracker are publicly accessible. Do not provide any private account information on your issues. If your problem is specific to your account, you should submit a support request as described above.
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To reproduce**
+Steps to reproduce the behavior.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Logs**
+If applicable, add any log output related to your problem.
+
+**SDK version**
+The version of this SDK that you are using.
+
+**Language version, developer tools**
+For instance, Go 1.11 or Ruby 2.5.3. If you are using a language that requires a separate compiler, such as C, please include the name and version of the compiler too.
+
+**OS/platform**
+For instance, Ubuntu 16.04, Windows 10, or Android 4.0.3. If your code is running in a browser, please also include the browser type and version.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I would love to see the SDK [...does something new...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context about the feature request here.

.github/actions/benchmarks/action.yml

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+name: Benchmarks
+description: "Runs the SDK's performance benchmarks."
+
+runs:
+  using: composite
+  steps:
+    - uses: ./.github/actions/get-go-version
+      id: go-version
+
+    - name: Run Benchmarks
+      id: benchmarks
+      shell: bash
+      run: make benchmarks | tee benchmarks.txt
+
+    - name: Upload Results
+      if: steps.benchmarks.outcome == 'success'
+      uses: actions/upload-artifact@v4
+      with:
+        name: Benchmarks-${{ steps.go-version.outputs.version }}
+        path: benchmarks.txt

.github/actions/coverage/action.yml

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+name: Coverage
+description: "Runs Go Server SDK's code-coverage checker."
+inputs:
+  enforce:
+    description: 'Whether to enforce coverage thresholds.'
+    required: false
+    default: 'false'
+
+
+runs:
+  using: composite
+  steps:
+    - uses: ./.github/actions/get-go-version
+      id: go-version
+
+    - name: Test with coverage
+      shell: bash
+      id: test-coverage
+      run: |
+        set +e
+        make test-coverage
+        status=$?
+        echo "coverage_status=$status" >> $GITHUB_OUTPUT
+
+    - name: Upload coverage results
+      uses: actions/upload-artifact@v4
+      with:
+        name: Coverage-result-${{ steps.go-version.outputs.version }}
+        path: build/coverage*
+
+    - name: Enforce coverage
+      shell: bash
+      run: |
+        if [ "${{ steps.test-coverage.outputs.coverage_status }}" != "0" ]; then
+          echo "Code isn't fully covered!"
+          if [ "${{ inputs.enforce }}" == "true" ]; then
+            exit 1
+          fi
+        else 
+          echo "Code is fully covered!"
+        fi

.github/actions/get-go-version/action.yml

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+name: Get Go Version
+description: "Gets the currently installed Go version."
+outputs:
+  version:
+    description: 'The currently installed Go version.'
+    value: ${{ steps.go-version.outputs.value }}
+
+runs:
+  using: composite
+  steps:
+    - name: Get Go version
+      id: go-version
+      shell: bash
+      run: |
+        echo "value=$(go version | awk '{print $3}')" >> $GITHUB_OUTPUT

.github/actions/unit-tests/action.yml

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+name: Unit Tests
+description: "Runs SDK's unit tests + linters and optionally gathers coverage."
+inputs:
+  lint:
+    description: 'Whether to run linters.'
+    required: false
+    default: 'false'
+
+runs:
+  using: composite
+  steps:
+    - uses: ./.github/actions/get-go-version
+      id: go-version
+
+    - name: Build (default implementation)
+      shell: bash
+      run: make build
+
+    - name: Build (easyjson implementation)
+      shell: bash
+      run: make build-easyjson
+
+    - name: Lint
+      if: inputs.lint == 'true'
+      shell: bash
+      run: make lint
+
+    - name: Test (default implementation)
+      shell: bash
+      id: test
+      run: make test | tee raw_report.txt
+
+    - name: Test (easyjson implementation)
+      shell: bash
+      id: test-easyjson
+      run: make test-easyjson | tee -a raw_report.txt
+
+    - name: Process test results
+      if: steps.test.outcome == 'success'
+      id: process-test
+      shell: bash
+      run: go run github.com/jstemmer/go-junit-report@v0.9.1 < raw_report.txt > junit_report.xml
+
+    - name: Upload test results
+      if: steps.process-test.outcome == 'success'
+      uses: actions/upload-artifact@v4
+      with:
+        name: Test-result-test${{ steps.go-version.outputs.version }}
+        path: junit_report.xml

.github/pull_request_template.md

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+**Requirements**
+
+- [ ] I have added test coverage for new or changed functionality
+- [ ] I have followed the repository's [pull request submission guidelines](../blob/master/CONTRIBUTING.md#submitting-pull-requests)
+- [ ] I have validated my changes against all supported platform versions
+
+**Related issues**
+
+Provide links to any issues in this repository or elsewhere relating to this pull request.
+
+**Describe the solution you've provided**
+
+Provide a clear and concise description of what you expect to happen.
+
+**Describe alternatives you've considered**
+
+Provide a clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+
+Add any other context about the pull request here.

.github/variables/go-versions.env

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+latest=1.23
+penultimate=1.22
+min=1.18

.github/workflows/check-go-versions.yml

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+name: Check Supported Go Versions
+on:
+  schedule:
+    - cron: "0 17 * * *"
+  workflow_dispatch:
+
+jobs:
+  check-go-eol:
+    runs-on: ubuntu-latest
+    outputs:
+      latest: ${{ steps.parse.outputs.latest }}
+      penultimate: ${{ steps.parse.outputs.penultimate }}
+    timeout-minutes: 2
+    steps:
+      - uses: actions/checkout@v4
+        # Perform a GET request to endoflife.date for the Go language. The response
+        # contains all Go releases; we're interested in the 0'th and 1'th (latest and penultimate.)
+      - name: Fetch officially supported Go versions
+        uses: JamesIves/fetch-api-data-action@396ebea7d13904824f85b892b1616985f847301c
+        with:
+          endpoint: https://endoflife.date/api/go.json
+          configuration: '{ "method": "GET" }'
+          debug: true
+        # Parse the response JSON and insert into environment variables for the next step.
+      - name: Parse officially supported Go versions
+        id: parse
+        run: |
+          echo "latest=${{ fromJSON(env.fetch-api-data)[0].cycle }}" >> $GITHUB_OUTPUT
+          echo "penultimate=${{ fromJSON(env.fetch-api-data)[1].cycle }}" >> $GITHUB_OUTPUT
+
+
+  create-prs:
+    permissions:
+      contents: write
+      pull-requests: write
+    needs: check-go-eol
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        branch: ["v3"]
+      fail-fast: false
+    env:
+      officialLatestVersion: ${{ needs.check-go-eol.outputs.latest }}
+      officialPenultimateVersion: ${{ needs.check-go-eol.outputs.penultimate }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ matrix.branch }}
+
+      - name: Get current Go versions
+        id: go-versions
+        run:  cat ./.github/variables/go-versions.env > $GITHUB_OUTPUT
+
+      - name: Update go-versions.env and README.md
+        if: steps.go-versions.outputs.latest != env.officialLatestVersion
+        id: update-go-versions
+        run: |
+          sed -i -e "s#latest=[^ ]*#latest=${{ env.officialLatestVersion }}#g" \
+                 -e "s#penultimate=[^ ]*#penultimate=${{ env.officialPenultimateVersion }}#g" \
+                  ./.github/variables/go-versions.env
+
+      - name: Create pull request
+        if: steps.update-go-versions.outcome == 'success'
+        uses: peter-evans/create-pull-request@v6
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          add-paths: |
+            .github/variables/go-versions.env
+          branch: "launchdarklyreleasebot/update-to-go${{ env.officialLatestVersion }}-${{ matrix.branch }}"
+          author: "LaunchDarklyReleaseBot <LaunchDarklyReleaseBot@launchdarkly.com>"
+          committer: "LaunchDarklyReleaseBot <LaunchDarklyReleaseBot@launchdarkly.com>"
+          labels: ${{ matrix.branch }}
+          title: "ci: bump tested Go versions to ${{ env.officialLatestVersion }} and ${{ env.officialPenultimateVersion }}"
+          commit-message: "Bumps from Go ${{ steps.go-versions.outputs.latest }} -> ${{ env.officialLatestVersion }} and ${{ steps.go-versions.outputs.penultimate }} -> ${{ env.officialPenultimateVersion }}."
+          body: |
+            - [ ] I have triggered CI on this PR (either close & reopen this PR in Github UI, or `git commit -m "run ci" --allow-empty && git push`)