Add Google Java Style format check to build and CI

Author: bramp

.github/workflows/test.yml

@@ -7,14 +7,30 @@ on:
     branches: [ "main" ]
 
 jobs:
+  format:
+    runs-on: ubuntu-latest
+    name: Format Check
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v5
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+          cache: maven
+
+      - name: Check formatting (Google Java Style)
+        run: mvn --batch-mode fmt:check
+
   test:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         java-version: [11, 17, 21]
 
-    name: JDK ${{ matrix.java-version }}
+    name: Test JDK ${{ matrix.java-version }}
 
     steps:
       - uses: actions/checkout@v6

pom.xml

@@ -422,6 +422,18 @@
                 </executions>
             </plugin>
 
+            <plugin>
+                <groupId>com.spotify.fmt</groupId>
+                <artifactId>fmt-maven-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+
         </plugins>
 
         <defaultGoal>install</defaultGoal>