Allow to set custom healthcheck endpoint path + app healthcheck

[sanasol]

Allow to set custom healthcheck endpoint path, add healthcheck to app

app endpoint is a bit tricky via middleware. Not sure is there is an another way to use env variable without rebuilding image, so made it like this to make it work 100% via docker-compose env variables.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: aabba47fea3bf3be09a47ebf644db3afffaa1698

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@hyperdx/api	Patch
@hyperdx/app	Patch

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