Add Github Workflow to run unit tests

.github/workflows/test.yml

@@ -0,0 +1,33 @@
+name: 'Run Tests'
+
+on:
+  push:
+    branches: [ 'master' ]
+    tags: [ '*' ]
+  pull_request:
+    branches: [ '*' ]
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v3
+        with:
+          java-version: '11'
+          distribution: 'temurin'
+
+      - name: Fetch Onkostar-API
+        run: |
+          curl --user dnpm:${{ secrets.PACKAGE_TOKEN }} \
+            https://git.dnpm.dev/api/packages/Plugin-JF-Onkostar/generic/onkostar-api/2.11.1.6/onkostar-api-2.11.1.6.jar \
+            --output libs/onkostar-api-2.11.1.6.jar
+
+      - name: Fetch ATC-Codes-Plugin
+        run: |
+          curl \
+            https://github.com/CCC-MF/onkostar-plugin-atccodes/releases/download/v0.6.0/onkostar-plugin-atccodes-0.6.0.jar \
+            --output libs/onkostar-plugin-atccodes-0.6.0.jar
+
+      - name: Execute tests
+        run: mvn --batch-mode verify