postgrest: Use env vars for connecting to the db.

Get rid of the hardcoded creds for this part at least (they're still in
the schema definition for now), but the main motivation at this point is
to be able to bootstrap the system.

The thing is: If the postgrest container is not able to connect to the
db it refuses to start and dies. This means the nginx container will not
be able to check the connection to the postgrest service, and it also
dies. Since ddev considers the system broken if the web container dies,
it just stops everything and kills the db container too.

Iow, we're not able to add the authenticator user to the db so that
postgrest will boot, and the rest of the system with it.

So to bootstrap the system, do the following:

Set PGRST_DB_USER and PGRST_DB_PASS both to the default ddev db user
("db").

Load the db schema:

    % ddev psql < sql/schema.sql

Change the PGRST_DB_USER and PGRST_DB_PASS to their proper
values, and store them in the .ddev/.env file.

Then restart the project:

    % ddev restart

The postgrest container should now use the correct credentials.

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