Stop deployment if .env file was manually edited (offer portal-setup-following)

[firyx]

OK. If this is our preferred approach then feel free to resolve this.

I still feel that this extra step is somehow unnecessary and many people will forget it and it will lead to a lot of frustration.

Is it possible to add a start-up step that does the following:

1. Compare the current content of .env to a backed up copy created during the last successful run of portal-setup-following (ignoring empty lines and trailing whitespace).
2. If the content differs, automatically re-run portal-setup-following.

This would be a great QoL improvement for portal operators.

Originally posted by @ro-tex in #291 (comment)