Add ci workflow

.github/workflows/ci.yml

@@ -0,0 +1,49 @@
+name: Continuous Integration
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          submodules: "recursive"
+
+      - name: Set up JDK environment
+        uses: actions/setup-java@v3
+        with:
+          distribution: "zulu"
+          java-version: 17
+
+      - name: Make gradlew executable
+        run: chmod +x ./gradlew
+
+      - name: Setup Gradle
+        uses: gradle/gradle-build-action@v2
+
+      - name: Run local unit tests
+        run: bash ./gradlew test --stacktrace
+
+  build:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          submodules: "recursive"
+
+      - name: Set up JDK environment
+        uses: actions/setup-java@v3
+        with:
+          distribution: "zulu"
+          java-version: 17
+
+      - name: Make gradlew executable
+        run: chmod +x ./gradlew
+
+      - name: Setup Gradle
+        uses: gradle/gradle-build-action@v2
+
+      - name: Build the app
+        run: bash ./gradlew build --stacktrace