feat: add enforce linkage checker

Author: athakor

google-cloud-asset-bom/pom.xml

@@ -108,6 +108,34 @@
           <skip>true</skip>
         </configuration>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-enforcer-plugin</artifactId>
+        <version>3.0.0-M3</version>
+        <dependencies>
+          <dependency>
+              <groupId>com.google.cloud.tools</groupId>
+              <artifactId>linkage-checker-enforcer-rules</artifactId>
+              <version>1.1.0</version>
+          </dependency>
+        </dependencies>
+        <executions>
+          <execution>
+            <id>enforce-linkage-checker</id>
+            <!-- Important! Should run after compile -->
+            <phase>verify</phase>
+            <goals>
+              <goal>enforce</goal>
+            </goals>
+            <configuration>
+              <rules>
+                <LinkageCheckerRule
+                        implementation="com.google.cloud.tools.dependencies.enforcer.LinkageCheckerRule"/>
+              </rules>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
     </plugins>
   </build>
-</project>
+</project>