fix: load config from stdin and parse CLI key,value pairs

[gabyx]

Proposed Changes

• Parse stdin config file with -.
• Set config values on every level with --config-value "a.b.c: 123" etc.

Types of Changes

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that apply

• A bug fix (non-breaking change which fixes an issue). Use MR tag
  bugfix.
• A new feature (non-breaking change which adds functionality). Use MR
  tag feature.
• A breaking change (fix or feature that would cause existing
  functionality to not work as expected). Use MR tag feature.
• A non-productive update (documentation, tooling, etc. if none of the
  other choices apply). Use MR tag chore.

Checklist

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the PR. If you're unsure about any of them, don't hesitate to ask. We're here to
help! This is simply a reminder of what we are going to look for before merging
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• I have read the
  CONTRIBUTING
  guidelines.

Further Comments

[codecov]

Codecov Report

Attention: Patch coverage is 66.80498% with 80 lines in your changes missing coverage. Please review.

Project coverage is 61.14%. Comparing base (75322d1) to head (b493492).

Files with missing lines	Patch %	Lines
pkg/config/config-key-values.go	70.31%	15 Missing and 4 partials ⚠️
pkg/cli/cmd/root/root.go	85.00%	11 Missing and 4 partials ⚠️
pkg/image/image-type.go	36.84%	12 Missing ⚠️
pkg/registry/registry-type.go	0.00%	12 Missing ⚠️
pkg/common/env_type.go	0.00%	9 Missing ⚠️
pkg/component/component-version.go	0.00%	6 Missing ⚠️
pkg/common/build-type.go	66.66%	2 Missing and 1 partial ⚠️
pkg/config/hooks.go	75.00%	2 Missing and 1 partial ⚠️
pkg/component/component-paths.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
- Coverage   61.53%   61.14%   -0.39%     
==========================================
  Files          90       92       +2     
  Lines        4877     5032     +155     
==========================================
+ Hits         3001     3077      +76     
- Misses       1638     1709      +71     
- Partials      238      246       +8     

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