Postgres docker container with postGIS and wal-e

Based on https://github.com/docker-library/postgres with postGIS and WAL-E installed.

Environment variables to pass to the container for postgres.

POSTGRES_USER=postgres

POSTGRES_PASSWORD

PGDATA=/var/lib/postgresql/data/pgdata

Environment variables to pass to the container for WAL-E, all of these must be present or WAL-E is not configured.

AWS_ACCESS_KEY_ID

AWS_SECRET_ACCESS_KEY

AWS_REGION

WALE_S3_PREFIX=\"s3://<bucketname>/<path>\"

WALE_RETAIN=7