docker: Use healthcheck endpoint

[bt90]

Purpose

Fixes #8638

Testing

Tested the cmd against a local instance with HTTP and HTTPS:

curl -fkLsS -m 2 127.0.0.1:8384/rest/noauth/health | grep -o --color=never OK || exit 1

Successful healthcheck:

OK

Failed healthcheck:

curl: (7) Failed to connect to 127.0.0.1 port 8384 after 0 ms: Connection refused

curl parameters:

• -f Fail fast with no output at all on server errors. Otherwise error pages are passed to grep
• -k Ignore certificate errors. Important if the UI is using HTTPS with a selfsigned certificate
• -L Follow redirects. Handles the HTTP -> HTTPS redirect
• -s Don't output download meter/progress
• -S Print error messages to stderr
• -m Abort after x seconds

[calmh]

Looks reasonable

[Tupsi]

can you make the port number configurable? I changed my gui port to the std 443 in the settings and because I use macvlan as a network driver I can not change the ports through -p/ports. I am currently using this for a healthcheck in my docker compose which seems to work, so I might as well just change the test: line to what you have here. Should work as well, right?

    healthcheck:
      test: nc -z 127.0.0.1 443 || exit 1
#      test: curl -fkLsS -m 2 127.0.0.1:443/rest/noauth/health | grep -o --color=never OK || exit 1
      timeout: 1s
      interval: 1m0s
      retries: 1

[bt90]

That should work.

@calmh would the STGUIADDRESS be appropriate to extract the port from?

[calmh]

I guess

[Tupsi]

This is tagged for 1.22.2 but is not in the current 1.22.2 image on docker hub as I mentioned #8705