Add a cloudbuild.yaml for tag releases. (GoogleContainerTools#126)

Author: dlorenc

cloudbuild-release.yaml

@@ -0,0 +1,14 @@
+# This cloudbuild is run on the creation of new tags, which should signify releases.
+steps:
+# Build the container that will do the go build.
+  - name: 'gcr.io/cloud-builders/docker'
+    args: ['build', '-t', 'builder', '-f', 'Dockerfile.build', '.']
+# Do the go build.
+  - name: 'builder'
+    args: ['make', 'cross']
+# Upload to GCS.
+  - name: 'gcr.io/cloud-builders/gsutil'
+    args: ['cp', '-r', 'out/*', 'gs://container-diff/$TAG_NAME/']
+# Tag as 'latest'.
+  - name: 'gcr.io/cloud-builders/gsutil'
+    args: ['cp', '-r', 'gs://container-diff/$TAG_NAME/*', 'gs://container-diff/latest/']