The pinned Postgres image, copied from Docker Hub to ghcr.io/weftsh/postgres
so that Weft's own CI can fetch it from a registry its runners already reach.
POSTGRES_RELEASE is the pin; the workflow copies that release, every platform,
by digest. Nothing is built here.
PostgreSQL is © the PostgreSQL Global Development Group, licensed under the PostgreSQL License; the image is the Docker Official Image, an unmodified copy.