(feature): docker health checks

[getpwnam]

Add health checks for each container in docker-compose.yml and updated dependencies to require healthy state in each case.

Container	Health Check Condition	Dependency
inventree-db	pg_isready succeeds	None
inventree-cache	redis-cli ping succeeds	None
inventree-server	GET to /api/system/health/ returns HTTP 200	inventree-db and inventree-cache must be healthy
inventree-worker	is_worker_running() returns True	inventree-server must be healthy
inventree-proxy	GET to /api/system/health/ with Host: ${INVENTREE_SITE_URL} returns HTTP 200	inventree-server and inventree-worker must be healthy

Tested on my v1.3.3 instance for around 10 days with no problems to report.

Would appreciate some extra testing/validation from a Docker expert.

Refs: #12122
Refs: #12123

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[SchrodingersGat]

I think we should expose an invoke command to determine the health of the background worker process - which could encapsulate the code her potentially

[SchrodingersGat]

@getpwnam thanks for submitting this, overall it looks pretty reasonable. What are your thoughts about exposing an internal function (e.g. invoke task) for background worker health check? This makes it a bit more general purpose I think.

Also, do you have any tracing or metrics over the 10 day period you have been running this? In particular what load does a 20s interval impose on the setup?

[SchrodingersGat]

Requested Improvements

• Update the docker documentation to include information about the health checks
• Add entry to CHANGELOG.md