Add GitHub Actions workflow for packaging Helm chart on release

.gitea/workflows/package-and-deploy.yaml

@@ -0,0 +1,34 @@
+name: Packaging Chart
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup latest Helm
+        uses: azure/setup-helm@v4.3.0
+        with:
+          version: latest
+        id: install
+      - name: Import GPG key
+        uses: crazy-max/ghaction-import-gpg@v6
+        with:
+          gpg_private_key: ${{ secrets.GPG_PRIVATE_KEY }}
+          passphrase: ${{ secrets.PASSPHRASE }}
+          trust_level: 5
+      - name: Export GPG key in legacy format
+        run: |
+          gpg --export-secret-keys --output /tmp/keyring.gpg ${{ secrets.GPG_KEY_ID }}
+      - name: Package Chart
+        run: |
+          helm dependency build ./charts/bookstack
+          helm package --version $CHART_VERSION --sign --keyring /tmp/keyring.gpg ./bookstack --dependency-update
+          curl -u $REPO_CREDENTIALS -F "chart=@bookstack-$CHART_VERSION.tgz" -F "prov=@bookstack-$CHART_VERSION.tgz.prov" https://charts.morlana.net/api/charts
+        env:
+          REPO_CREDENTIALS: ${{ secrets.REPO_CREDENTIALS }}
+          CHART_VERSION: ${{ github.event.release.tag_name }}