Build proxy image in Gradle (#179)

proxy/build.gradle

@@ -16,7 +16,11 @@ apply plugin: 'java'
 
 createUberJar('deployJar', 'proxy_server', 'google.registry.proxy.ProxyServer')
 
-project.build.dependsOn deployJar
+task buildProxyImage(dependsOn: deployJar, type: Exec) {
+  commandLine 'docker', 'build', '-t', 'proxy', '.'
+}
+
+project.build.dependsOn buildProxyImage
 
 dependencies {
   def deps = rootProject.dependencyMap

release/cloudbuild-proxy.yaml

@@ -13,24 +13,24 @@
 # To trigger a build automatically, follow the instructions below and add a trigger:
 # https://cloud.google.com/cloud-build/docs/running-builds/automate-builds
 steps:
-# Set permissions correctly. Not sure why it is necessary, but it is.
-# Build the deploy jar.
+# Build the proxy docker image.
 - name: 'gcr.io/${PROJECT_ID}/builder:latest'
   args:
   - './gradlew'
   - ':proxy:test'
-  - ':proxy:deployJar'
+  - ':proxy:buildProxyImage'
   - '-PmavenUrl=https://storage.googleapis.com/domain-registry-maven-repository/maven'
   - '-PpluginsUrl=https://storage.googleapis.com/domain-registry-maven-repository/plugins'
-# Build the docker image.
+# Tag and push the image. We can't let Cloud Build's default processing do that for us
+# because we need to push the image before we can sign it in the following step.
 - name: 'gcr.io/${PROJECT_ID}/builder:latest'
-  args: ['docker', 'build', '--tag', 'gcr.io/${PROJECT_ID}/proxy:${TAG_NAME}', '.']
+  entrypoint: /bin/bash
+  args:
+  - -c
+  - |
+    docker tag proxy gcr.io/${PROJECT_ID}/proxy:${TAG_NAME}
+    docker push gcr.io/${PROJECT_ID}/proxy:${TAG_NAME}
   dir: 'proxy'
-# Push the image. We can't let Cloud Build's default processing do that for us
-# because we need to push the image before we can sign it in the following
-# step.
-- name: 'gcr.io/${PROJECT_ID}/builder:latest'
-  args: ['docker', 'push', 'gcr.io/${PROJECT_ID}/proxy:${TAG_NAME}']
 # Get the image digest, sign it and substitute in the digest in the tagging yaml file.
 - name: 'gcr.io/${PROJECT_ID}/builder:latest'
   entrypoint: /bin/bash