Issues with https://www.pulumi.com/learn/building-with-pulumi/

[fingolfint]

The code is inconsistent and causes failures:

1. my_first_app vs my-second-app
2. my_first_app:mongoHost vs my_first_app:mongo_host
3. running pulumi up on my_first_app staging will fail if my_first_app dev is still running as there is a port clash for the mongo container

[fingolfint]

more problems: image=backend.base_image_name, ^^^^^^^^^^^^^^^^^^^^^^^ should be
image=backend.repo_digest,