The purpose of the repository is to be generic enough that most of the Postgres server versions can be built by using this repository.
The scripts in the repo uses generic notes and installation instructions from https://www.postgresql.org/docs/9.6/static/installation.html
The official Postgres docker repository only contains the images for the current major version and its minor version builds.
Official Postgres images in Docker Hub https://hub.docker.com/_/postgres
Clone the repository
git clone git@github.com:purinda/docker-postgres.git
Build, the MAJOR and MINOR values gets concatanated to build an specific version image.
MAJOR=8.4 && MINOR=21 && ./build.sh
Now you can run the following to see the built image
docker images
The image tag can be used in your docker-compose file under Image tag or run standalone as below
docker run -it --rm --link some-postgres:postgres postgres psql -h postgres -U postgres