update README and meta information

update yamllint

version bump for k0s to 1.30.0

update build env
update tests

remove deprecated (since ansible 2.16) get_md5 parameter

fix molecule test

Reduction of the running time

Reduction of 'changed' tasks

add collection bodsch.scm

rename k0s example configuration

try downstream for multi-controller and multi-worker workflows
update README

k0s is not running properly in a docker container.

The tests are therefore not meaningful and must be reduced to a minimum.

Feature/gh 4 fix problem with installation of additional controllers (#5

)

* evaluate additional controllers
* update some tasks and modules
* fix some linting things (e.g. ansible FQDN)
* add `k0s_extra_arguments.controller`
* update README