other: Improve health check for docker-compose.

[PMExtra]

For now, all services in docker-compose that using superset image will inherit the health check from the image. But the image is built for web app default.

So I made this change that using celery inspect ping for worker health check. And it also disabled health check for init and worker-beat services because they are always failed (unhealthy).

[villebro]

LGTM and change makes sense, but pinging Daniel for second opinion.

[kakoni]

@PMExtra
For worker-beat one could do

    healthcheck:
      test: ["CMD-SHELL", "[ -f /proc/$$(cat /tmp/celerybeat.pid)/status ]"]

[PMExtra]

@kakoni I don't think so. It only checks if the process exists. But a health-check should check if the function effective.
And I think it make an unnecessary move. if the process is quit, the celery command should return and the container should be stopped.
What do you think?

[kakoni]

@PMExtra Ah right, thats correct.

[dpgaspar]

Sorry for the delay here, LGTM, can you plz solve current conflits @PMExtra ?