Add a healthcheck to the Docker container image

[nineinchnick]

By defining a healthcheck command in the container image, users can quickly see if the container is ready to accept requests in the output of docker ps:

% docker ps
CONTAINER ID   IMAGE                      COMMAND                  CREATED         STATUS                            PORTS      NAMES
8c630f90bbbc   trino:368-SNAPSHOT-amd64   "/usr/lib/trino/bin/…"   8 seconds ago   Up 7 seconds (health: starting)   8080/tcp   gifted_gauss
% docker ps
CONTAINER ID   IMAGE                      COMMAND                  CREATED              STATUS                        PORTS      NAMES
8c630f90bbbc   trino:368-SNAPSHOT-amd64   "/usr/lib/trino/bin/…"   About a minute ago   Up About a minute (healthy)   8080/tcp   gifted_gauss

Without this, the STATUS column only shows the uptime.

It also frees uses from having to figure out the exact condition and they can use a generic loop that would wait for the container to be ready, like so:

until docker inspect "${CONTAINER_ID}" --format "{{json .State.Health.Status }}" | grep -q '"healthy"'; do
  sleep 1
done

If the healthcheck fails 3 times, it'll start showing as unhealthy. To see more details about the failure, one would have to run docker inspect $CONTAINER_ID --format "{{json .State.Health}}", or run it one more time as docker exec -it $CONTAINER_ID /usr/lib/trino/bin/health-check.

This healthcheck is enabled by default and can be disabled by adding --no-healthcheck to docker run.

The same healthcheck script could be used in readiness and liveness probes in https://github.com/trinodb/charts

[electrum]

See comments, otherwise looks good. Thanks for adding this feature