setup github actions

Signed-off-by: Peter Siegmund <developer@mars3142.org>

.github/dependabot.yml

@@ -0,0 +1,11 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      
+  - package-ecosystem: "maven"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/deploy-hetzner.yaml

@@ -0,0 +1,40 @@
+---
+name: 'deploy to hetzner'
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Cancel Previous Runs
+        uses: styfle/cancel-workflow-action@0.12.1
+        with:
+          access_token: ${{ github.token }}
+
+      - name: Cloning repo
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+          cache: maven
+
+      - name: Build and test with Maven
+        run: mvn --batch-mode --update-snapshots verify
+
+      - name: Push to dokku
+        timeout-minutes: 15
+        uses: dokku/github-action@master
+        with:
+          branch: main
+          git_remote_url: ${{ secrets.HETZNER_GIT_URI }}
+          ssh_private_key: ${{ secrets.SSH_PRIVATE_KEY }}
+          git_push_flags: --force