Add GitHub Action to verify the Java code

- Ensures that it compiles

- Checks formatting

.github/workflows/verify-java.yml

@@ -0,0 +1,28 @@
+name: verify-java
+
+on:
+    pull_request:
+    push:
+        branches:
+            - main
+
+jobs:
+    build:
+        runs-on: ubuntu-latest
+        #
+        steps:
+            # This step uses the `actions/checkout` action to download a copy of your repository on the runner.
+            -   uses: actions/checkout@v3
+            # This step uses the `actions/setup-java` action to configure the Eclipse Temurin (Java) 17 JDK by
+            # Eclipse Adoptium.
+            -   name: Set up JDK 17
+                uses: actions/setup-java@v3
+                with:
+                    java-version: '17'
+                    distribution: 'temurin'
+                    cache: maven
+            # The "Build with Maven" step runs the Maven `verify` target in non-interactive mode to ensure that your
+            # code builds, tests pass, and a package can be created.
+            # The -f option indicates the root of the Maven project, where the pom.xml is located
+            -   name: Build with Maven
+                run: mvn -f 'Java/Single Calls' --show-version --batch-mode --update-snapshots verify