Smart-prom-next

- prerelease version
- remove old devices from metrics - see 52 and 53

- update to 3.10.6-slim-bullseye

- provide pypi (pip) release
- reduce Docker image sizes

- fix typo in log
- add Alpine Docker image flavor
- make Alpine image smaller
- add -slim-bullseye suffix to image
- improve logs with "error" and "warning" prefix