fix: init temporary logger to print errors during startup

[padlar]

Closes #142.

Before the logger

➜  image-scanner-operator git:(init-logger) ✗ ./bin/manager

After the call to SetupLogger (console encoder)

  image-scanner-operator git:(init-logger) ✗ ./bin/manager
2023-01-26T15:35:50.911+0100	INFO	setup	required flag/env not set	{"flag": "scan-job-namespace", "env": "SCAN_JOB_NAMESPACE"}

With the SetupLogger with the default Json Encoder

➜  image-scanner-operator git:(init-logger) ✗ ./bin/manager
{"level":"info","ts":"2023-01-26T14:25:13+01:00","logger":"setup","msg":"required flag/env not set","flag":"scan-job-namespace","env":"SCAN_JOB_NAMESPACE"}

[erikgb]

Looks a lot better already, but maybe simple console logging if this happens?

[erikgb]

How does the fail output look like now?