feat: use a more specific error type for no container info

[MorrisLaw]

This PR adds a new error type to when ContainerInfo comes back nil while verifying the configuration. It currently returns errorInvalidConfig, this change will return errorNoContainerInfo instead. Similar to how we return errorNoImageInfo when ImageInfo is nil.

[codecov]

Codecov Report

Merging #1115 (1c93c5f) into main (3bf9340) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1115   +/-   ##
=======================================
  Coverage   61.96%   61.96%           
=======================================
  Files          22       22           
  Lines        1438     1438           
=======================================
  Hits          891      891           
  Misses        463      463           
  Partials       84       84           

Impacted Files	Coverage Δ
pkg/container/container.go	45.36% <100.00%> (ø)

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[piksel]

Can't argue with being more specific in error messages. Thanks!

Not so sure I'd call it a refactor though... 😅