Fix dev environment when running as root on the host

Without this, CURRENT_UID isnt actually passed in from the host, and wipes out /etc/passwd even when we’re actually running as root.

I tested this as a non-root user on Linux, and on Docker for Mac

tools/docker-compose.yml

@@ -7,6 +7,7 @@ services:
     container_name: tools_awx_1
     hostname: awx
     environment:
+      CURRENT_UID:
       RABBITMQ_HOST: rabbitmq
       RABBITMQ_USER: guest
       RABBITMQ_PASS: guest