Add unit test workflow

.github/workflows/tests.yml

@@ -0,0 +1,25 @@
+name: Test
+
+on:
+  pull_request: { }
+  push:
+    branches: [ main, develop ]
+
+# Enrich gradle.properties for CI/CD
+env:
+  GRADLE_OPTS: -Dorg.gradle.jvmargs="-Xmx3072m -Dfile.encoding=UTF-8 -XX:+HeapDumpOnOutOfMemoryError" -Dkotlin.daemon.jvm.options="-Xmx2560m" -Dkotlin.incremental=false
+  CI_GRADLE_ARG_PROPERTIES: --stacktrace -PpreDexEnable=false --max-workers 4 --no-daemon
+
+jobs:
+  tests:
+    name: Runs unit tests
+    runs-on: ubuntu-latest
+
+    # Allow all jobs on main and develop. Just one per PR.
+    concurrency:
+      group: ${{ github.ref == 'refs/heads/main' && format('unit-tests-main-{0}', github.sha) || github.ref == 'refs/heads/develop' && format('unit-tests-develop-{0}', github.sha) || format('unit-tests-{0}', github.ref) }}
+      cancel-in-progress: true
+    steps:
+      - uses: actions/checkout@v3
+      - name: Run tests
+        run: ./gradlew test $CI_GRADLE_ARG_PROPERTIES