Added error checking for env vars and flags

[enrichman]

Removed TODO and added error checking for viper environment variables and flags.

related to #1870 and #1859

---

Suppressing errors is not a good idea. If anything occurs we should be aware of it.

The problem of the log.Fatal(err) approach is that it's the only viable option in the init() func (that's why I'm not a fan of them). They are used in the Cobra user guide, and that's why this setup is widespread.

But this is something that they don't like as well, and I guess that they are more or less working on it:

• Preventing excessive global variables (project layout/design) spf13/cobra#1599
• [RFC] improve generated boilerplate spf13/cobra-cli#12
• • [RFC] improve generated boilerplate. spf13/cobra#1614

[codecov-commenter]

Codecov Report

Base: 56.36% // Head: 50.70% // Decreases project coverage by -5.66% ⚠️

Coverage data is based on head (b6ee78d) compared to base (1839df2).
Patch coverage: 83.56% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1875      +/-   ##
==========================================
- Coverage   56.36%   50.70%   -5.67%     
==========================================
  Files         179      179              
  Lines       14454    14497      +43     
==========================================
- Hits         8147     7350     -797     
- Misses       5260     6145     +885     
+ Partials     1047     1002      -45     

Flag	Coverage Δ
acceptance-api	36.66% <83.56%> (+2.93%)	⬆️
acceptance-apps	36.36% <83.56%> (+0.10%)	⬆️
acceptance-cli	42.48% <83.56%> (-9.26%)	⬇️
unittests	8.50% <94.64%> (+0.25%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
helpers/kubernetes/config/checker.go	54.16% <25.00%> (-5.84%)	⬇️
helpers/tracelog/logger.go	39.39% <25.00%> (-3.94%)	⬇️
internal/duration/duration.go	78.26% <25.00%> (-21.74%)	⬇️
internal/cli/root.go	75.67% <75.00%> (-1.60%)	⬇️
helpers/kubernetes/config/argtoenv.go	100.00% <100.00%> (ø)
helpers/kubernetes/config/config.go	57.14% <100.00%> (+3.29%)	⬆️
internal/cli/server.go	90.74% <100.00%> (+1.85%)	⬆️
internal/cli/settings.go	16.07% <100.00%> (-34.86%)	⬇️
pkg/api/core/v1/models/namespace.go	0.00% <0.00%> (-100.00%)	⬇️
internal/api/v1/configuration/match.go	0.00% <0.00%> (-82.36%)	⬇️
... and 74 more

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