App migrations

[nemchik]

I think we can implement a way to handle migrations when we switch images, ex: letsencrypt to swag, or oznu's cf ddns to hotio's cf ddns or hydra2 to nzbhydra2.

Right now we have some minimal stuff in https://github.com/GhostWriters/DockSTARTer/blob/master/.scripts/env_sanitize.sh but we should split anything app specific out into separate files. To keep things clean we can probably make a subfolder in the scripts folder and have one file per app matching the app name (maybe prefixed or something). We would also need a standard way to figure out if a migration is needed. Likely compare the enabled apps to the list of files in the migrations folder (loop over them and look for a match) and then run the function. The function in the migration file would determine if the app needs a migration. Possibly by checking for old env vars or file/folder locations and only taking action if needed. At the end of each migration function we should prompt the user to remove any variables or files/folders that triggered the migration function to think it needs to complete a migration.

[github-actions]

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[nemchik]

Keep this