feat(docker): Add a post push hook to make sure the latest tag gets built.

Author: cooperaj

hooks/post_push

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+set -e
+
+# Parse image name for repo name
+tagStart=$(expr index "$IMAGE_NAME" :)
+repoName=${IMAGE_NAME:0:tagStart-1}
+
+docker tag $IMAGE_NAME ${repoName}:${tag}
+docker push ${repoName}:latest