FYI, the lead Alpine packager is stepping down
Know the docker image relies on alpine and not sure if/how this might impact that choice. Just an FYI
Even if it did the docker container isn’t that complex migrating to something like the Debian php container would be relatively trivial.
Also Alpine is so widely used I would be shocked if there was no one willing to pick it up, either from the corporate world or just from an uptick in community contributions.