Update DATABASE_CONNECTION_URI to use DATABASE_URL

Author: malkanestate-code

.env.example

@@ -52,7 +52,7 @@ DEL_INSTANCE=false
 
 # Provider: postgresql | mysql | psql_bouncer
 DATABASE_PROVIDER=postgresql
-DATABASE_CONNECTION_URI='postgresql://user:pass@postgres:5432/evolution_db?schema=evolution_api'
+DATABASE_CONNECTION_URI=$DATABASE_URL'
 # Client name for the database connection
 # It is used to separate an API installation from another that uses the same database.
 DATABASE_CONNECTION_CLIENT_NAME=evolution_exchange