Publish from GitHub Actions

.github/workflows/publish.yml

@@ -0,0 +1,28 @@
+name: Publish
+on:
+  push:
+    tags:
+      - "v0.*"
+jobs:
+  publish:
+    environment:
+      name: gradle-plugin-portal
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up OpenJDK 8
+      uses: actions/setup-java@v3
+      with:
+        java-version: 8
+        distribution: "temurin"
+    - name: Publish
+      run: ./gradlew --stacktrace publishPlugins
+      env:
+        GRADLE_PUBLISH_KEY: ${{ secrets.GRADLE_PUBLISH_KEY }}
+        GRADLE_PUBLISH_SECRET: ${{ secrets.GRADLE_PUBLISH_SECRET }}
+        # "ORG_GRADLE_PROJECT_" environment variables with dots do not work indeed.
+        # https://github.com/gradle/gradle/issues/1295
+        ORG_GRADLE_PROJECT_gradle.publish.key: ${{ secrets.GRADLE_PUBLISH_KEY }}
+        ORG_GRADLE_PROJECT_gradle.publish.secret: ${{ secrets.GRADLE_PUBLISH_SECRET }}