Spotify tokener image: HEALTHCHECK uses nc but nc is not installed (container always unhealthy)

[leon-sm]

The Spotify tokener Docker image defines a HEALTHCHECK using nc, but nc is not installed in the final image, so the container is always marked unhealthy even though the service runs fine.

From docker inspect:

/bin/sh: 1: nc: not found

This seems specific to the Spotify tokener image. Installing netcat or changing the healthcheck would fix it.