Upload proxy manifests during GCB build

GCB will now upload the images to GCR and the manifests to GCS. A Spinnaker pipeline can then be triggered by the GCB Pub/Sub message and use both the image and the manifests to deploy the proxy to GKE.

Also temporarily moves customized Maven repo location while it is being worked on.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=239853011

java/google/registry/proxy/BUILD

@@ -78,5 +78,4 @@ container_push(
     image = ":proxy_image",
     registry = "gcr.io",
     repository = "GCP_PROJECT/IMAGE_NAME",
-    tag = "bazel",
 )

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

@@ -17,7 +17,7 @@ spec:
     spec:
       containers:
       - name: proxy
-        image: gcr.io/GCP_PROJECT/IMAGE_NAME:bazel
+        image: gcr.io/GCP_PROJECT/proxy:latest
         ports:
         - containerPort: 30000
           name: health-check

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

@@ -17,7 +17,7 @@ spec:
     spec:
       containers:
       - name: proxy
-        image: gcr.io/GCP_PROJECT/IMAGE_NAME:bazel
+        image: gcr.io/GCP_PROJECT/proxy:latest
         ports:
         - containerPort: 30000
           name: health-check

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

@@ -17,7 +17,7 @@ spec:
     spec:
       containers:
       - name: proxy-canary
-        image: gcr.io/GCP_PROJECT/IMAGE_NAME:bazel
+        image: gcr.io/GCP_PROJECT/proxy:latest
         ports:
         - containerPort: 30000
           name: health-check

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

@@ -17,7 +17,7 @@ spec:
     spec:
       containers:
       - name: proxy
-        image: gcr.io/GCP_PROJECT/IMAGE_NAME:bazel
+        image: gcr.io/GCP_PROJECT/proxy:latest
         ports:
         - containerPort: 30000
           name: health-check

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

@@ -17,7 +17,7 @@ spec:
     spec:
       containers:
       - name: proxy-canary
-        image: gcr.io/GCP_PROJECT/IMAGE_NAME:bazel
+        image: gcr.io/GCP_PROJECT/proxy:latest
         ports:
         - containerPort: 30000
           name: health-check

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

@@ -17,7 +17,7 @@ spec:
     spec:
       containers:
       - name: proxy
-        image: gcr.io/GCP_PROJECT/IMAGE_NAME:bazel
+        image: gcr.io/GCP_PROJECT/proxy:latest
         ports:
         - containerPort: 30000
           name: health-check