Currently vikunja has a `/health` endpoint that was added in https://kolaente.dev/vikunja/vikunja/pulls/998. Docker/compose cannot utilize this feature since vikunja's docker image doesn't have curl/wget as it is pruned which is great for the image size. This PR adds a `healthcheck` command that send an http request to `/health` and exits with 0 or non-zero depending on the result.
It also adds a `HEALTHCHECK` to the docker image which calls this automatically.
Reviewed-on: https://kolaente.dev/vikunja/vikunja/pulls/2856
Reviewed-by: konrad <k@knt.li>
Co-authored-by: ScribblerCoder <omar2001.oh@gmail.com>
Co-committed-by: ScribblerCoder <omar2001.oh@gmail.com>
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