Remove PostgreSQL 12 since it is end of life

12/alpine3.20/Dockerfile

12/alpine3.20/docker-ensure-initdb.sh

12/alpine3.20/docker-entrypoint.sh

12/alpine3.21/Dockerfile

12/alpine3.21/docker-ensure-initdb.sh

12/alpine3.21/docker-entrypoint.sh

12/bookworm/Dockerfile

12/bookworm/docker-ensure-initdb.sh

12/bookworm/docker-entrypoint.sh

12/bullseye/Dockerfile

12/bullseye/docker-ensure-initdb.sh

12/bullseye/docker-entrypoint.sh

13/alpine3.20/Dockerfile

13/alpine3.20/docker-entrypoint.sh

13/alpine3.21/Dockerfile

13/alpine3.21/docker-entrypoint.sh

13/bookworm/docker-entrypoint.sh

13/bullseye/docker-entrypoint.sh

14/alpine3.20/Dockerfile

14/alpine3.20/docker-entrypoint.sh