YAML Install postgres 9.1 with postgis on CircleCI

circle.yml

database:
  # Use postgres 9.1
  pre:
    - sudo service postgresql stop && sudo apt-get remove -y postgresql-9.3 && sudo apt-get update && sudo apt-get install -y postgresql-9.1 postgresql-contrib-9.1 postgresql-9.1-postgis-2.1
    - sudo sed -i "s/\port = 5433/port = 5432/" /etc/postgresql/9.1/main/postgresql.conf
    - sudo cp /etc/postgresql/9.3/main/pg_hba.conf /etc/postgresql/9.1/main/pg_hba.conf
    - sudo service postgresql restart
    - sudo -u postgres createuser ubuntu -d --superuser
    - createdb circle_test

  # Activate postgis
  post:
    - psql -c "CREATE EXTENSION postgis;" -d circle_test
    - psql -c "CREATE EXTENSION postgis_topology;" -d circle_test