Add healthchecks and change to stock image

Peterson, Peterrequested to merge
healthchecks into next

This copies healthchecks over and moves to using the stock nginx image. docker-compose.dev.yml is modified to aid in migrating information into test/docker-compose.yml and will be removed in a future PR.

Refs https://code.ornl.gov/sns-hfir-scse/reflectometry/reflectometry/-/issues/382

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