adds DATABASE_SSL_KEY_BASE64 for pg connection

DATABASE_SSL_KEY_BASE64 takes priority over DATABASE_SSL env var

If neither are provided, no ssl value will be used.
This allows for the usage of PGSSLMODE

docker/docker-compose.yml

@@ -17,6 +17,7 @@ services:
             - DATABASE_USER=${DATABASE_USER}
             - DATABASE_PASSWORD=${DATABASE_PASSWORD}
             - DATABASE_SSL=${DATABASE_SSL}
+            - DATABASE_SSL_KEY_BASE64=${DATABASE_SSL_KEY_BASE64}
             - APIKEY_PATH=${APIKEY_PATH}
             - SECRETKEY_PATH=${SECRETKEY_PATH}
             - FLOWISE_SECRETKEY_OVERWRITE=${FLOWISE_SECRETKEY_OVERWRITE}