Postgis
Definition
A Postgis Resource is defined in convox.yml and linked to one or more Services.
    resources:
      main:
        type: postgis
    services:
      web:
        resources:
          - main
Options
A Postgis Resource can have the following options configured for it (default values are shown):
    resources:
      main:
        type: postgis
        options:
          version: 10-3.2
          storage: 10