Auto-bump patch version on PR merge with deploy key

.github/workflows/release.yml

@@ -1,41 +1,45 @@
 name: Release
 
 on:
-  push:
+  pull_request:
+    types: [closed]
     branches: [main]
 
 jobs:
   release:
+    if: github.event.pull_request.merged == true
     runs-on: ubuntu-latest
     permissions:
       contents: write
     steps:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
+          ssh-key: ${{ secrets.VERSION_BUMP_KEY }}
 
-      - name: Get version from package.json
-        id: version
+      - name: Bump patch version
+        id: bump
         run: |
-          VERSION=$(jq -r '.version // empty' package.json)
-          if [[ -z "$VERSION" ]]; then
-            echo "No version in package.json, skipping release"
-            echo "skip=true" >> "$GITHUB_OUTPUT"
-            exit 0
-          fi
-          TAG="v$VERSION"
-          if git rev-parse "$TAG" >/dev/null 2>&1; then
-            echo "Tag $TAG already exists, skipping release"
-            echo "skip=true" >> "$GITHUB_OUTPUT"
-            exit 0
-          fi
-          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
-          echo "tag=$TAG" >> "$GITHUB_OUTPUT"
-          echo "skip=false" >> "$GITHUB_OUTPUT"
+          CURRENT=$(jq -r '.version' package.json)
+          MAJOR=$(echo "$CURRENT" | cut -d. -f1)
+          MINOR=$(echo "$CURRENT" | cut -d. -f2)
+          PATCH=$(echo "$CURRENT" | cut -d. -f3)
+          NEW_PATCH=$((PATCH + 1))
+          NEW_VERSION="${MAJOR}.${MINOR}.${NEW_PATCH}"
+          echo "version=$NEW_VERSION" >> "$GITHUB_OUTPUT"
+          echo "Bumping $CURRENT → $NEW_VERSION"
+          jq --arg v "$NEW_VERSION" '.version = $v' package.json > tmp.json && mv tmp.json package.json
 
-      - name: Generate changelog
-        if: steps.version.outputs.skip == 'false'
-        id: changelog
+      - name: Commit version bump
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add package.json
+          git commit -m "bump to v${{ steps.bump.outputs.version }}"
+          git push
+
+      - name: Generate release notes
+        id: notes
         run: |
           PREV_TAG=$(git describe --tags --abbrev=0 2>/dev/null || echo "")
           if [[ -n "$PREV_TAG" ]]; then
@@ -44,19 +48,22 @@ jobs:
             RANGE="HEAD"
           fi
           NOTES=$(git log "$RANGE" --oneline --no-merges 2>/dev/null | head -50)
+          if [[ -z "$NOTES" ]]; then
+            NOTES="Merged: ${{ github.event.pull_request.title }}"
+          fi
           {
             echo "notes<<EOF"
             echo "$NOTES"
             echo "EOF"
           } >> "$GITHUB_OUTPUT"
 
       - name: Create tag and release
-        if: steps.version.outputs.skip == 'false'
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
-          git tag "${{ steps.version.outputs.tag }}"
-          git push origin "${{ steps.version.outputs.tag }}"
-          gh release create "${{ steps.version.outputs.tag }}" \
-            --title "${{ steps.version.outputs.tag }}" \
-            --notes "${{ steps.changelog.outputs.notes }}"
+          TAG="v${{ steps.bump.outputs.version }}"
+          git tag "$TAG"
+          git push origin "$TAG"
+          gh release create "$TAG" \
+            --title "$TAG" \
+            --notes "${{ steps.notes.outputs.notes }}"