feat: Allow postgres connections that require ssl mode (#409)

Closes #261

docker-compose.yml

@@ -23,6 +23,14 @@ services:
       - TRUST_PROXY=0
       - DATABASE_URL=postgresql://postgres@postgres/planka
       - SECRET_KEY=notsecretkey
+
+      # related: https://github.com/knex/knex/issues/2354
+      # As knex does not pass query parameters from the connection string we
+      # have to use environment variables in order to pass the desired values, e.g.
+      # - PGSSLMODE=<value>
+
+      # Configure knex to accept SSL certificates
+      # - KNEX_REJECT_UNAUTHORIZED_SSL_CERTIFICATE=false
     depends_on:
       - postgres