Add a cloudbuild.yaml trigger for container-diff releases. (GoogleContainerTools#125)

Author: dlorenc

Dockerfile.build

@@ -0,0 +1,6 @@
+# Dockerfile used to build a build step that builds container-diff in CI.
+FROM golang:1.9
+RUN apt-get update && apt-get install make
+RUN mkdir -p /go/src/github.com/GoogleCloudPlatform/
+RUN ln -s /workspace /go/src/github.com/GoogleCloudPlatform/container-diff
+WORKDIR /go/src/github.com/GoogleCloudPlatform/container-diff

cloudbuild.yaml

@@ -0,0 +1,10 @@
+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/builds/$COMMIT_SHA/']