Custom version sorting in detect-versions for latestVersionTag

[DenKoren]

When git repository faces both 'v-' prefixed version tags and regular tags, it splits them into two groups during sort even when we ask it to sort 'as version numbers'.
This causes wrong 'latest' version detection.

I tried to solve the problem by giving 'v-' prefixed tags higher priority than regular, but this logic sucks when we switch FROM v-prefixed style TO regular.

This problem should be solved with plain JS :(

[DenKoren]

Done.
github docker workflow is now able to keep version tag updated for each release.

E.g. when you release v2.12.4 and it is latest modification of 'v2', you can set workflow to update :2 tag.