Use forgejo actions instead of drone

.drone.yml

@@ -1,72 +0,0 @@
-kind: pipeline
-type: docker
-name: default
-steps:
-  - name: build
-    image: maven:3.9-eclipse-temurin-25
-    commands:
-      - mvn clean install -DskipTests=true -Dmaven.javadoc.skip=true -B -V
-    when:
-      ref:
-        include:
-          - refs/heads/main
-          - refs/heads/feature/**
-          - refs/tags/**
-  - name: test
-    image: maven:3.9-eclipse-temurin-25
-    commands:
-      - mvn test -B
-    when:
-      branch:
-        include:
-          - main
-          - feature/*
-#  - name: deploy
-#    image: maven:3.9-eclipse-temurin-25
-#    environment:
-#      REPO_TOKEN:
-#        from_secret: repo-token
-#      REPO_TOKEN_OSSRH:
-#        from_secret: repo-token-ossrh
-#    commands:
-#      - mvn -s maven-settings.xml deploy -DskipTests=true
-#    when:
-#      branch:
-#        - main
-#      event:
-#        exclude:
-#          - pull_request
-  - name: build_docker_image
-    image: plugins/docker
-    settings:
-      registry: gittr.ch
-      username: manuel
-      password:
-        from_secret: docker-token
-      repo: gittr.ch/java/a-maze-r
-      tags:
-        - latest-snapshot
-      dockerfile: docker/Dockerfile
-    when:
-      branch:
-        - main
-      event:
-        exclude:
-          - pull_request
-          - tag
-  - name: build_docker_image_release
-    image: plugins/docker
-    settings:
-      registry: gittr.ch
-      username: manuel
-      password:
-        from_secret: docker-token
-      repo: gittr.ch/java/a-maze-r
-      tags:
-        - latest
-        - ${DRONE_TAG}
-      dockerfile: docker/Dockerfile
-    when:
-      event:
-        include:
-          - tag

.forgejo/workflows/maven-build.yaml

@@ -0,0 +1,22 @@
+on: [push]
+jobs:
+  maven-build:
+    runs-on: docker
+    container:
+      image: node:25-trixie
+    steps:
+      - name: Setup Java
+        uses: actions/setup-java@v5
+        with:
+          distribution: 'temurin'
+          java-version: 25
+      - name: Install maven
+        run: |
+          apt-get update
+          apt-get install -y maven
+      - 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

maven-settings.xml

@@ -3,6 +3,7 @@
           xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.1.0 http://maven.apache.org/xsd/settings-1.1.0.xsd"
           xmlns="http://maven.apache.org/SETTINGS/1.1.0">
     <servers>
+        <!-- obsolete -->
         <server>
             <id>repo.gittr.ch</id>
             <username>ci</username>