QoL issues

[tg44]

A small list;

• The app is failing, but the container stays in a running state.
  • Repro; use RS256 as a token algo, without a valid key
• When wrong files are set as keyfile config, we should warn
  • Repro; use RS256 as a token algo, give a valid path to the keyfile, check if the app starts. Misspell the path, the app will throw a "DER length" error. At this point we should get a warning bcs the filepath is not empty but we can't read the file. (Also this would warn to permission issues.)
• It seems that when we use the /config folder with a file named application.conf we don't preload the application.conf from classpath anyway
  • Repro; add a volume bind with an empty application.conf file to the /config and check the exceptions we get