databases/pg_tilserv: add new port
pg_tileserv is a PostGIS-only tile server written in Go.
By restricting itself to only using PostGIS as a data source,
pg_tileserv gains the following features:
- Automatic configuration. The server can discover and
automatically publish as tiles sources all tables it has read
access to: just point it at a PostgreSQL/PostGIS database.
- Full SQL flexibility. Using function layers, the server can
run any SQL to generate tile outputs. Any data processing,
feature filtering, or record aggregation that can be expressed in SQL,
can be exposed as parameterized tile sources.
- Database security model. You can restrict access to tables and
functions using standard database access control.
This means you can also use advanced access control techniques,
like row-level security to dynamically filter access based on the
login role.