Improve tagging of released docker images
As @creak pointed out at our matrix channel there is another issue with the docker image release process:
I am upgrading the all-in-one container on my server and I noticed that the 1.1 tags doesn't point to the 1.1.2 "sub"-release.
I think it is good practice to always point the tag to its latest sub-release (for instance "1" and "1.1" would both point to "1.1.2")
so, if Funkwhale is following semantic versioning, one can decide to always trust the security fixes by putting the tag "x.y"
and one can also always trust non breaking upgrades by putting just "x"