Create maven.yml

Author: wjglerum

.github/workflows/maven.yml

@@ -0,0 +1,37 @@
+# This workflow will build a Java project with Maven, and cache/restore any dependencies to improve the workflow execution time
+# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven
+
+name: Java CI with Maven
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  workflow_dispatch:
+
+jobs:
+  get-exercises:
+    runs-on: ubuntu-latest
+    outputs:
+      matrix: ${{steps.list_dirs.outputs.matrix}}
+    steps:
+      - uses: actions/checkout@v2
+      - id: list_dirs
+        run: echo "::set-output name=matrix::$(ls code | jq -cnR '[inputs | select(length>0)]')"
+  build:
+    runs-on: ubuntu-latest
+    needs: get-exercises
+    strategy:
+      matrix:
+        subdir: ${{fromJson(needs.get-exercises.outputs.matrix)}}    
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up JDK
+      uses: actions/setup-java@v3
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+        cache: maven
+    - name: Test with Maven
+      run: mvn -B verify