(java): Add an Action to test the Java lambda

Author: alex9smith

.github/workflows/test-java.yaml

@@ -0,0 +1,21 @@
+name: Test Java Lambda
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          java-version: "21"
+          distribution: "microsoft"
+          cache: maven
+      - name: Build and test with Maven
+        run: AWS_REGION=eu-west-2 mvn test