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by andy_ppp 1346 days ago
Looking at the Alpine docker file(s) for Postgres you might be able to use the one for the release candidate and set en environment variable of PGVERSION=15.0 which should use https://ftp.postgresql.org/pub/source/v15.0/ here.

You would need to figure out what the package name is on Debian (if it even exists yet?) it's currently set to ENV PG_VERSION 15~rc2-1.pgdg110+1

YMMV.