Add support for automated releases

.github/workflows/build.yml

@@ -4,6 +4,7 @@
 # - run Qodana inspections,
 # - run 'buildPlugin' task and prepare artifact for the further tests,
 # - run 'runPluginVerifier' task,
+# - create a draft release.
 #
 # Workflow is triggered on push and pull_request events.
 #
@@ -120,4 +121,38 @@ jobs:
         uses: actions/upload-artifact@v3
         with:
           name: ${{ steps.artifact.outputs.filename }}
-          path: ./build/distributions/content/*/*
+          path: ./build/distributions/content/*/*
+
+  # Prepare a draft release for GitHub Releases page for the manual verification
+  # If accepted and published, release workflow would be triggered
+  releaseDraft:
+    name: Release Draft
+    if: github.event_name != 'pull_request'
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+
+      # Check out current repository
+      - name: Fetch Sources
+        uses: actions/checkout@v2.4.0
+
+      # Remove old release drafts by using the curl request for the available releases with draft flag
+      - name: Remove Old Release Drafts
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh api repos/{owner}/{repo}/releases \
+            --jq '.[] | select(.draft == true) | .id' \
+            | xargs -I '{}' gh api -X DELETE repos/{owner}/{repo}/releases/{}
+      # Create new release draft - which is not publicly visible and requires manual acceptance
+      - name: Create Release Draft
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh release create v${{ needs.build.outputs.version }} \
+            --draft \
+            --title "v${{ needs.build.outputs.version }}" \
+            --notes "$(cat << 'EOM'
+          ${{ needs.build.outputs.changelog }}
+          EOM
+          )"

.github/workflows/release.yml

@@ -0,0 +1,84 @@
+# GitHub Actions Workflow created for handling the release process based on the draft release prepared with the Build workflow.
+
+name: Release
+on:
+  release:
+    types: [prereleased, released]
+
+jobs:
+
+  # Prepare and publish the plugin to the Marketplace repository
+  release:
+    name: Publish Plugin
+    runs-on: ubuntu-latest
+    steps:
+
+      # Check out current repository
+      - name: Fetch Sources
+        uses: actions/checkout@v2.4.0
+        with:
+          ref: ${{ github.event.release.tag_name }}
+
+      # Setup Java 11 environment for the next steps
+      - name: Setup Java
+        uses: actions/setup-java@v2
+        with:
+          distribution: zulu
+          java-version: 11
+          cache: gradle
+
+      # Set environment variables
+      - name: Export Properties
+        id: properties
+        shell: bash
+        run: |
+          CHANGELOG="$(cat << 'EOM' | sed -e 's/^[[:space:]]*$//g' -e '/./,$!d'
+          ${{ github.event.release.body }}
+          EOM
+          )"
+
+          CHANGELOG="${CHANGELOG//'%'/'%25'}"
+          CHANGELOG="${CHANGELOG//$'\n'/'%0A'}"
+          CHANGELOG="${CHANGELOG//$'\r'/'%0D'}"
+
+          echo "::set-output name=changelog::$CHANGELOG"
+
+      # Update Unreleased section with the current release note
+      - name: Patch Changelog
+        if: ${{ steps.properties.outputs.changelog != '' }}
+        env:
+          CHANGELOG: ${{ steps.properties.outputs.changelog }}
+        run: |
+          ./gradlew patchChangelog --release-note="$CHANGELOG"
+
+      # Build the zip distribution
+      - name: Build Zip Plugin
+        run: ./gradlew buildPlugin
+
+      # Upload artifact as a release asset
+      - name: Upload Release Asset
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: gh release upload ${{ github.event.release.tag_name }} ./build/distributions/*
+
+      # Create pull request
+      - name: Create Pull Request
+        if: ${{ steps.properties.outputs.changelog != '' }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          VERSION="${{ github.event.release.tag_name }}"
+          BRANCH="changelog-update-$VERSION"
+
+          git config user.email "action@github.com"
+          git config user.name "GitHub Action"
+
+          git checkout -b $BRANCH
+          git commit -am "Changelog update - $VERSION"
+          git push --set-upstream origin $BRANCH
+
+          gh pr create \
+            --title "Changelog update - \`$VERSION\`" \
+            --body "Current pull request contains patched \`CHANGELOG.md\` file for the \`$VERSION\` version." \
+            --base main \
+            --head $BRANCH