The previous example on using an alternative image isn't verbose enough for some users, so we use the new readme generation facilities to inject a note for postgis usage. Closes #213
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Official Postgres docker images does not include postgis extension (amongst others). The following example creates a new postgres service using postgis/postgis:13-3.1 image, which includes the postgis extension.
dokku postgres:create postgis-database --image "postgis/postgis" --image-version "13-3.1"