feat(ci): chart release workflow (backport #71)

.github/helm-release-config.yml

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+release-name-template: "v{{ .Version }}"
+release-notes-file: release-notes.md

.github/release.yml

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+changelog:
+  categories:
+    - title: '🚀 Features'
+      labels: 
+        - 'feat'
+    - title: '🔧 Fixes'
+      labels: 
+        - 'fix'
+    - title: '📄 Documentation'
+      labels: 
+        - 'docs'
+    - title: '⚙️ Maintenance'
+      labels:
+        - 'chore'
+        - 'ci'
+        - 'perf'
+        - 'test'
+        - 'build'
+    - title: 'Others'
+      labels:
+        - "*"

.github/workflows/helm-release.yml

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+name: Release Helm Chart
+
+on:
+  workflow_dispatch:
+
+jobs:
+  helm-release:
+    permissions:
+      contents: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Configure Git
+        run: |
+          git config user.name "$GITHUB_ACTOR"
+          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
+      - name: Get release version
+        id: release-version
+        run: |
+          echo "tag=v$(yq .version charts/cryostat/Chart.yaml)" >> $GITHUB_OUTPUT
+      - name: Get previous version
+        id: previous-version
+        run: |
+          # Filter tags by regex, combine with the Chart version, sort by version number, and output the preceeding version.
+          chart_version="${{ steps.release-version.outputs.tag }}"
+          previous_version="$({ echo v${chart_version}; git tag -l | grep -E '^v[0-9]+\.[0-9]+\.[0-9]+$'; } | sort -V | grep -B1 "${chart_version}" | head -n1)"
+          echo "tag=${previous_version}" >> $GITHUB_OUTPUT
+      - name: Generate release notes
+        env:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+        run: |
+          gh api --method POST \
+            -H "Accept: application/vnd.github+json" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            /repos/${GITHUB_REPOSITORY}/releases/generate-notes \
+            -f tag_name="${{ steps.release-version.outputs.tag }}" \
+            -f target_commitish="${GITHUB_REF_NAME}" \
+            -f previous_tag_name="${{ steps.previous-version.outputs.tag }}" | jq -r .body > charts/cryostat/release-notes.md
+      - name: Run chart-releaser
+        uses: helm/chart-releaser-action@v1.5.0
+        env:
+          CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+        with:
+          version: v1.5.0
+          charts_dir: charts
+          config: .github/helm-release-config.yml

charts/cryostat/release-notes.md

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+<!-- Release notes generated using configuration in .github/release.yml -->