Add Alpine 3.22 (remove Alpine 3.20)

[tianon]

See also:

• Add Alpine 3.21 and drop 3.19 #2174
• https://wiki.alpinelinux.org/wiki/Release_Notes_for_Alpine_3.22.0
• alpine: add 3.22.0 as latest, remove EOL 3.18 docker-library/official-images#19135

[tianon]

Strange that https://github.com/nodejs/docker-node/actions/workflows/build-test.yml is disabled -- is that intentional?

[tianon]

(close / reopen to pick up the now-enabled CI 💪)

[nschonni]

Strange that https://github.com/nodejs/docker-node/actions/workflows/build-test.yml is disabled -- is that intentional?

Was disabled as part of #2208, but I've enabled it again. I see you already toggled the build, but just leaving the comment for awareness

[github-actions]

Created PR on the official-images repo (docker-library/official-images#19156). See https://github.com/docker-library/faq#an-images-source-changed-in-git-now-what if you are wondering when it will be available on the Docker Hub.