Celery worker restart

[dmanjunath]

Problem:
Celery workers don't have auto reloading and getting latest changes for a worker tends to be a tricky and painstaking process. Current methods of development include running the worker locally in venv or calling down/up on the compose file for every code change.

Solution:
By mounting the code volume into the discovery container, we can propagate the latest code changes into the container. Then we can call docker restart <container-id> to trigger the new code to be run on restart.

Testing:
I tested this locally by adding a log in the index.py flow

try:
  # Attempt to acquire lock - do not block if unable to acquire
  have_lock = update_lock.acquire(blocking=False)
  if have_lock:
    logger.warning('dheeraj here ')

I then ran discovery worker and made sure it printed out in the logs. I then changed the log message and called the docker restart command and verified the new message showed up in the logs.

[hareeshnagaraj]

lgtm