build: failing to push to docker hub fails the build.

packaging/docker/build-deploy.sh

@@ -1,4 +1,5 @@
 #!/bin/sh
+set -e
 
 _grafana_version=$1
 ./build.sh "$_grafana_version"

packaging/docker/push_to_docker_hub.sh

@@ -1,4 +1,5 @@
 #!/bin/sh
+set -e
 
 _grafana_tag=$1