Create github pages deploy for javadocs (#2231)

.github/workflows/docs.yml

@@ -0,0 +1,42 @@
+name: Generate javadoc github pages
+
+on:
+  push:
+    branches: [ master ]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: true
+
+jobs:
+  docs:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 17
+        uses: actions/setup-java@v2
+        with:
+          java-version: 17
+          distribution: temurin
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+      - name: Generate documentation directory
+        uses: gradle/gradle-build-action@v2.4.2
+        with:
+          arguments: javadoc
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v1
+        with:
+          path: './build/docs/javadoc'
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@main