Add release action

.github/workflows/release.yml

@@ -0,0 +1,43 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+permissions:
+  contents: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+
+      - name: Set up Gradle
+        uses: gradle/actions/setup-gradle@v3
+
+      - name: Build with Gradle
+        run: ./gradlew assembleDist
+
+      - name: Create release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh release create "$GITHUB_REF_NAME" \
+            --repo "$GITHUB_REPOSITORY" \
+            --title "Helma $GITHUB_REF_NAME" \
+            --generate-notes
+
+      - name: Upload assets
+        run: |
+          gh release upload "$GITHUB_REF_NAME" \
+            build/distributions/helma-*.* \
+            --clobber