Support for Postgres SSL Mode variable

When running an external PostgreSQL server with SSL enabled ( e.g. in Azure ), the connection string used in Studio cannot be constructed in a way to add the sslmode option. Connections will fail, saying

Error: no pg_hba.conf entry for host "x.x.x.x", user "xxx", database "xxx", no encryption

Suggesting to add an environment variable POSTGRES_SSL_MODE to enable sslmode