feat: migrate grpc-gcp to maven

cloudbuild.yaml

@@ -1,7 +1,7 @@
 steps:
-- name: eclipse-temurin:17-jdk
+- name: maven:3.9.11-eclipse-temurin-17
   dir: 'grpc-gcp'
   env:
   - 'GCP_PROJECT_ID=grpc-gcp-testing'
-  entrypoint: './gradlew'
-  args: ['verifyGoogleJavaFormat', 'allTests', '--info']
+  entrypoint: 'mvn'
+  args: ['fmt:check', 'verify', '-DskipITs=false']

grpc-gcp/README.md

@@ -74,7 +74,13 @@ git clone https://github.com/GoogleCloudPlatform/grpc-gcp-java.git && cd grpc-gc
 Build project with unit tests.
 
 ```sh
-./gradlew build
+mvn verify
+```
+
+Install the jar to your local Maven repository.
+
+```sh
+mvn install
 ```
 
 ## Test
@@ -89,16 +95,30 @@ export GOOGLE_APPLICATION_CREDENTIALS=path/to/key.json
 export GCP_PROJECT_ID=project_id
 ```
 
+Run unit tests.
+
+```sh
+mvn test
+```
+
 Run unit tests and integration tests:
 
 ```sh
-./gradlew allTests
+mvn verify -DskipITs=false
+```
+
+## Publish
+
+Publish a release build using the Maven release profile inherited from shared config.
+
+```sh
+mvn deploy -DperformRelease=true
 ```
 
 ## Code Format
 
 Run google-java-format
 
 ```sh
-./gradlew goJF
+mvn fmt:format
 ```