Forces pulling down base image before building new image via goreleas…

…er (#1264)

.goreleaser.yml

@@ -9,6 +9,8 @@ before:
     - go mod download
     # you may remove this if you don't need go generate
     - go generate ./...
+    # Pulls down the latest version of the controller's parent image
+    - docker pull ubuntu:18.04
 builds:
   - id: "manager"
     binary: manager
@@ -41,7 +43,6 @@ dockers:
       - "kudobuilder/controller:latest"
       - "kudobuilder/controller:{{ .Tag }}"
     skip_push: auto
-
 archives:
   - id: kubectl-kudo-tarball
     builds: