config sanity check

[piksel]

This will check the container configuration for obvious errors before trying to recreate it, preventing at least some know fault conditions.

[codecov]

Codecov Report

Merging #925 (4097c85) into main (b4cf17d) will increase coverage by 6.48%.
The diff coverage is 73.07%.

@@            Coverage Diff             @@
##             main     #925      +/-   ##
==========================================
+ Coverage   40.14%   46.62%   +6.48%     
==========================================
  Files          25       25              
  Lines        1415     1437      +22     
==========================================
+ Hits          568      670     +102     
+ Misses        785      700      -85     
- Partials       62       67       +5     

Impacted Files	Coverage Δ
internal/actions/update.go	50.47% <30.00%> (-0.55%)	⬇️
pkg/container/container.go	47.31% <100.00%> (+47.31%)	⬆️
pkg/notifications/shoutrrr.go	73.43% <100.00%> (+0.42%)	⬆️
pkg/notifications/email.go	90.90% <0.00%> (+4.54%)	⬆️
pkg/container/client.go	14.59% <0.00%> (+14.59%)	⬆️
pkg/container/metadata.go	63.63% <0.00%> (+63.63%)	⬆️
pkg/container/util.go	100.00% <0.00%> (+100.00%)	⬆️

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