use actual EOL date instead of index of array
Currently https://alpinelinux.org/releases/ shows that alpine Linux v3.15 is EOL but reciving the same support level as v3.16 (which is not EOL). Which datapoint should I trust more? The EOL date or the support state?
According to https://gitlab.alpinelinux.org/alpine/infra/alpine-mksite/-/blob/5b6615fe0655fb715266a3c1861fbca57b795cd0/_scripts/generate_release_branches.lua#L37 the support state is taken from the index of the array. This seems kind of a bad idea.
Sadly I am missing lua knowledge and have to many other project to send you a proper merge request.