Use bazel rules to build docker image and push to GCR

Using bazel to build and push image result in reproducible builds.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=187252645

java/google/registry/proxy/kubernetes/proxy-deployment.yaml

@@ -20,7 +20,7 @@ spec:
           secretName: proxy-account
       containers:
       - name: proxy
-        image: INSERT_YOUR_IMAGE_NAME_HERE
+        image: gcr.io/GCP_PROJECT/IMAGE_NAME:bazel
         ports:
         - containerPort: 30000
           name: health-check
@@ -41,6 +41,7 @@ spec:
         volumeMounts:
         - name: service-account
           mountPath: /var/secrets/google
+        imagePullPolicy: Always
         args: ["--log"]
         env:
         - name: GOOGLE_APPLICATION_CREDENTIALS