Does app.yml persist between docker upgrades?

Im working on a plugin and the instructions I received was to update the app.yml discourse file (the plugin overrides the email template).

The problem with this, I believe, is that while plugins persist between upgrades I don’t know / believe that the app.yml file does. Does anyone know if the app.yml file persists when you perform a version update? If it doesn’t, are we suppose to put the template override location in the plugin.rb file?

It persists. It is out of docker daemon or your container’s reach.

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The app.yml file is what determines how Discourse is configured. It wouldn’t make sense for Discourse to change it.