Add GitHub actions workflow

.github/workflows/build.yaml

@@ -0,0 +1,26 @@
+name: StubJars build
+run-name: ${{ github.actor }} is testing code 🚀
+on:
+  - push
+jobs:
+  test_stubjars:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up JDK 11 for x64
+      uses: actions/setup-java@v3
+      with:
+        java-version: '11'
+        distribution: 'corretto'
+        architecture: x64
+    - name: Validate Gradle wrapper
+      uses: gradle/wrapper-validation-action@v1.1.0
+    - name: Build the code
+      uses: gradle/gradle-build-action@v2.9.0
+      with:
+        arguments: assemble
+    - name: Run the test suite
+      uses: gradle/gradle-build-action@v2.9.0
+      with:
+        arguments: test
+