setup forgejo CI

.forgejo/workflows/build.yaml

@@ -0,0 +1,30 @@
+on: 
+  push:
+    branches: [master]
+
+jobs:
+  build:
+    runs-on: docker
+    container:
+    image: eclipse-temurin:21-jdk
+
+    steps:
+      - name: checkout repository
+        uses: actions/checkout@v3
+
+      - name: make gradle wrapper executable
+        run: chmod +x ./gradlew
+
+      - name: build
+        run: ./gradlew build
+
+      - name: capture build artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: Artifacts
+          with:
+            name: app-jar
+            path: |
+              build/libs/*.jar
+              !build/libs/*-sources.jar
+              !build/libs/*-javadoc.jar