* add 5.10
* use `command` instead of entrypoint (uses the correct luanti/minetest binary)
* use latest luanti container for automerge test and as docker-compose default
* drop 5.6 from ci
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Co-authored-by: BuckarooBanzay <BuckarooBanzay@users.noreply.github.com>
* switch over (hopefully) to github based docker registery for later minetest versions as the minetest gitlab is essentially abandoned
* bump min minetest version to 5.6
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Co-authored-by: BuckarooBanzay <BuckarooBanzay@users.noreply.github.com>