⏪️(helm) bring back helm chart

This is a revert of 1da5a removing actual deployments and keeping
only the dev environment in Tilt.

The clean-up was a bit heavy handed. We should keep the Helm
chart to the development repository and move away only the
deployment configuration.

.github/workflows/docker-hub.yml

@@ -8,6 +8,9 @@ on:
       - 'main'
     tags:
       - 'v*'
+  pull_request:
+    branches:
+      - 'main'
 
 env:
   DOCKER_USER: 1001:127