perf: Deactivafe force-unsafe-io. I'd rather builds take a couple of seconds longer than risking failures due to disabled safety features.

Configure Renovate

See merge request !1

refactor: Switch ARGs, provide defaults, add aliases. Basically, merge the three dockerfiles into one.

ci: Manually build multiarch image as we are dealing with a BASEimage here. Want to do things from ground up as possible.