Add generate-javadoc job

.forgejo/workflows/build-and-test.yml

@@ -37,6 +37,29 @@ jobs:
       path: |
         **/build/libs/*-sources.jar
       if-no-files-found: error
+ generate-javadoc:
+  runs-on: docker
+  container:
+   image: git.staropensource.de/staropensource/actions-docker:java
+  steps:
+   - name: Checkout
+     uses: https://code.forgejo.org/actions/checkout@v4
+   - name: Compile
+     run: ./gradlew --no-daemon javadoc javadocAll
+   - name: Upload separate javadoc
+     uses: https://code.forgejo.org/forgejo/upload-artifact@v4
+     with:
+      name: javadoc-separate
+      path: |
+        **/build/docs/javadoc/*
+      if-no-files-found: error
+   - name: Upload combined javadoc
+     uses: https://code.forgejo.org/forgejo/upload-artifact@v4
+     with:  
+      name: javadoc-combined
+      path: |
+        /build/docs/javadoc/*
+      if-no-files-found: error
  test:
   runs-on: docker
   container: