Improve healthcheck logging

[Jberczel]

I've upgraded mrsk from version 0.11.0 to 0.12.0, and since then, the health check has been failing during my deploys.

After investigating, I discovered that my app is using a ruby-slim image that doesn't include curl by default.

I had difficulty tracking down the issue because the healthcheck container is always stopped and removed after a failed health check.

To address this problem, I have made changes to the code that will output the container health log before stopping and removing the health check container.

Example output:

 ERROR {
  "Status": "unhealthy",
  "FailingStreak": 28,
  "Log": [
    {
      "Start": "2023-05-03T18:37:18.671956589Z",
      "End": "2023-05-03T18:37:18.736151422Z",
      "ExitCode": 1,
      "Output": "/bin/sh: 1: curl: not found\n"
    },
    ...

[dhh]

cc @kevinmcconnell

[kevinmcconnell]

This looks great @Jberczel 👍

Thanks also for fixing my typo ;)