Remove drone, add forgejo actions.

.forgejo/workflows/maven-build.yaml

@@ -0,0 +1,13 @@
+on: [push]
+jobs:
+  pkgcheck:
+    runs-on: docker
+    container:
+      image: maven:3.9-eclipse-temurin-25 
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+      - name: Run maven build
+        run: mvn clean install -DskipTests=true -Dmaven.javadoc.skip=true -B -V
+      - name: Run tests
+        run: mvn test -B