Weak health checks for ooni services

[DecFox]

It seems we have weak health checks which easily bypass the docker-smoketest we have. This can also be seen in the codepipeline logs:

+ docker logs ooniapi-smoketest-20970
--
531 | INFO:     Started server process [1]
532 | INFO:     Waiting for application startup.
533 | INFO:     Application startup complete.
534 | INFO:     Uvicorn running on http://0.0.0.0:80 (Press CTRL+C to quit)
535 | (psycopg2.OperationalError) connection to server at "localhost" (127.0.0.1), port 5432 failed: Connection refused
536 | Is the server running on that host and accepting TCP/IP connections?
537 | connection to server at "localhost" (::1), port 5432 failed: Cannot assign requested address
538 | Is the server running on that host and accepting TCP/IP connections?
539 |  
540 | (Background on this error at: https://sqlalche.me/e/20/e3q8)
541 | INFO:     172.18.0.1:34152 - "GET /health HTTP/1.1" 200 OK

We should trandform these into real health check for the services. The key component missing here is passing the required environment variables.