Add variable to .env to change db host

added comment about removing 'db' container if using your own db server.

It sadly does not download the latest source, thinking it already did that. As such, it just pushes the old image.

It sadly does not download the latest source, thinking it already did that. As such, it just pushes the old image.

Arm supports currently different version numbers than x64

Reduce the number of stages

Reduce number of stages

ci: add gha caching for dev images

- I think we should skip caching in production image building because we want fresh image