Add support for Alpine Linux 3.16; drop end-of-life branches

[dpward]

The latest release of Czkawka depends on Rust 1.60+, which is only available in Alpine Linux 3.16. (Older releases of Czkawka have been packaged with jlesage/docker-czkawka.)

Also please note that Alpine Linux 3.10, 3.11, and 3.12, which all have configuration files in this repository, have now reached end-of-life.

Both comments above also apply to jlesage/docker-baseimage-gui.

Thank you!