1 - Crie o contêiner do Postgres
docker run --name=PostGIS -e POSTGRES_USER=admin -e POSTGRES_PASSWORD=admin -e POSTGRES_DB=geolocation -p 5421:5432 -d postgres
2 - Acesse o bash do contêiner
docker exec -it PostGIS bash
3 - instale o PostGIS
apt-get update && apt-get install postgis -y
4 - Acesse o banco de dado geolocation
psql -U admin -h localhost -d geolocation
5- Rode os comandos
CREATE EXTENSION postgis;
CREATE EXTENSION postgis_topology;