feat: Add release automation config

.chglog/CHANGELOG-LINK.tpl.md

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+# CHANGELOG LINK
+This is CHANGELOG after this repository was forked from CosmWasm/cosmwasm.
+{{ range .Versions }}
+## {{ if .Tag.Previous }}{{ .Tag.Name }}{{ else }}{{ .Tag.Name }}{{ end }}
+{{ range .CommitGroups -}}
+### {{ .Title }}
+{{ range .Commits -}}
+- {{ if .Scope }}**{{ .Scope }}:** {{ end }}{{ .Subject }}
+{{ end }}
+{{ end -}}
+{{- if .NoteGroups -}}
+{{ range .NoteGroups -}}
+### {{ .Title }}
+{{ range .Notes }}
+{{ .Body }}
+{{ end }}
+{{ end -}}
+{{ end -}}
+{{ end -}}

.chglog/config.yml

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+style: github
+template: CHANGELOG-LINK.tpl.md
+info:
+  title: CHANGELOG
+  repository_url: https://github.com/line/cosmwasm
+options:
+  commits:
+    filters:
+      Type:
+        - feat
+        - fix
+        - perf
+        - refactor
+  commit_groups:
+    title_maps:
+      feat: Features
+      fix: Fixes
+      perf: Performance Improvements
+      refactor: Code Refactoring
+  header:
+    pattern: "^(\\w*)\\:\\s(.*)$"
+    pattern_maps:
+      - Type
+      - Subject
+  notes:
+    keywords:
+      - BREAKING CHANGE

.github/workflows/changelog.yml

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+name: changelog
+
+on:
+  pull_request:
+
+jobs:
+  changelog:
+    name: Generate Changelog
+    if: startsWith(github.event.pull_request.head.ref, 'release-v')
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Get version
+        id: get_version
+        env:
+          HEAD_REF: ${{ github.event.pull_request.head.ref }}
+        run: echo ::set-output name=VERSION::${HEAD_REF#release-v}
+      - name: Create new tag
+        run: |
+          git tag v${{ steps.get_version.outputs.VERSION }}
+
+      - name: Update CHANGELOG-LINK.md
+        working-directory: ./
+        run: |
+          docker pull quay.io/git-chglog/git-chglog:latest
+          docker run -v "$PWD":/workdir quay.io/git-chglog/git-chglog -o CHANGELOG-LINK.md v0.12.0-0.1.0..
+      - name: Merge CHANGELOG-LINK.md
+        uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          commit_message: "chore: Update CHANGELOG-LINK.md"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/release.yml

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+name: Release
+
+on:
+  pull_request:
+    branches:
+      - main
+    types: [closed]
+
+jobs:
+  release:
+    if: github.event.pull_request.merged == true && startsWith(github.event.pull_request.head.ref, 'release-v')
+    runs-on: ubuntu-latest
+    container: cibuilds/github:0.13
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Get version
+        id: get_version
+        run: echo ::set-output name=VERSION::${HEAD_REF#release-v}
+        env:
+          HEAD_REF: ${{ github.event.pull_request.head.ref }}
+      - name: Install Docker client
+        run: |
+          apk add docker-cli
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Prepare volume with source code
+        run: |
+          # create a dummy container which will hold a volume with config
+          docker create -v /code --name with_code alpine /bin/true
+          # copy a config file into this volume
+          docker cp ./Cargo.toml with_code:/code
+          docker cp ./contracts with_code:/code
+          docker cp ./packages with_code:/code
+      - name: Build development contracts
+        run: |
+          echo "Building all contracts under ./contracts"
+          docker run --volumes-from with_code cosmwasm/rust-optimizer:0.11.0 ./contracts/*/
+      - name: Check development contracts
+        working-directory: ./
+        run: |
+          echo "Checking all contracts under ./artifacts"
+          docker run --volumes-from with_code rust:1.51.0 /bin/bash -e -c 'cd ./code/packages/vm; ./examples/check_contract.sh ../../artifacts/*.wasm'
+          docker cp with_code:/code/artifacts .
+
+      - name: Create Release
+        id: create_release
+        uses: softprops/action-gh-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: v${{ steps.get_version.outputs.VERSION }}
+          body: ${{ github.event.pull_request.body }}
+          files: |
+            ./artifacts/*
+          draft: false
+          prerelease: false

docs/release.md

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+# How to release.
+- Please refer to the following file for the config file for release.
+1. .github/changelog.yml
+  - Update CHANGELOG when issuing a PR for release.
+2. .github/release.yml
+  - Executed when PR is merged into main.
+
+### What we can do with this.
+1. Automatically create a new version from the branch name.
+2. Automatically generate and commit a changelog.
+3. Upload dev contracts
+4. Publish
+
+### Release process
+1. Update the version of Cargo.toml.
+2. Make PR to main branch
+  - The format of the branch name should be release-vx.x.x-x.x.x.
+  - PR's comment becomes the body of the release notes.
+3. On the PR, CI job(changelog.yml) extracts target version from branch name.
+4. CI job create new tag from branch name.
+5. CI job generates the changelog and appends to CHANGELOG-LINK.md
+  - using [git-chglog](https://github.com/git-chglog/git-chglog)
+6. Github Actions automatically commit CHANGELOG-LINK.md.
+7. PR review.
+8. merge -> main
+9. On the main, CI job(release.yml) publish artifacts and create release notes.