* specify user in rootless container numerically
With kubernetes' PodSecurityPolicy set to runAsNonRoot it will not allow starting the container. The error message is
```
Error: container has runAsNonRoot and image has non-numeric user (git), cannot verify user is non-root
```
The `USER` directive has to be numerical for that to work.
* mention the name of the uid/gid
Co-authored-by: 6543 <6543@obermui.de>
* Add environment-to-app.ini routine
* Call environment-to-ini in docker setup scripts
* Automatically convert section vars to lower case to match documentation
* Remove git patch instructions
* Add env variable documentation to Install Docker
* When building rootless docker image move chown&chmod to build stage
Fixes#13577
* Fix command newlines
* Move chown to COPY command
* Seems to be working also without chmod
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
* docker: rootless image
* improve docs + remove check for write perm on custom
* add more info on ssh passtrough
* Add comment for internal ssh server in container config
