ci: auto-update CHANGELOG.md on release

Author: skyline69

.github/workflows/release.yml

@@ -129,6 +129,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
 
       - name: Download all artifacts
         uses: actions/download-artifact@v4
@@ -151,3 +153,20 @@ jobs:
             artifacts/agcp-v${{ needs.changelog.outputs.version }}-*.zip
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Generate full changelog
+        uses: orhun/git-cliff-action@v4
+        with:
+          args: --tag v${{ needs.changelog.outputs.version }}
+        env:
+          GITHUB_REPO: ${{ github.repository }}
+          OUTPUT: CHANGELOG.md
+
+      - name: Commit changelog to main
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add CHANGELOG.md
+          git diff --cached --quiet && exit 0
+          git commit -m "docs: update changelog for v${{ needs.changelog.outputs.version }}"
+          git push origin HEAD:main