ci: separate lint, run tests on code changes

[panekj]

Split lint into separate job and limit Go tests to run only for changes that affect the code
Add gitattributes and renormalize files

[github-actions]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ EDITORCONFIG	editorconfig-checker	3		0	0.01s
✅ REPOSITORY	gitleaks	yes		no	3.3s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	9.74s
✅ REPOSITORY	secretlint	yes		no	1.28s
✅ REPOSITORY	trivy-sbom	yes		no	0.74s
✅ REPOSITORY	trufflehog	yes		no	5.19s
⚠️ YAML	prettier	2		1	0.28s
✅ YAML	v8r	2		0	2.37s

See detailed report in MegaLinter reports
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.29%. Comparing base (5a80a04) to head (b395fbb).
Report is 176 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #2679       +/-   ##
===========================================
+ Coverage   61.56%   74.29%   +12.72%     
===========================================
  Files          53       72       +19     
  Lines        9002    11051     +2049     
===========================================
+ Hits         5542     8210     +2668     
+ Misses       3020     2208      -812     
- Partials      440      633      +193     

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[ChristopherHX]

if ci is skipped due to such a filter then is the status check missing (not skipped, just not present) => we might need changes to mergify / permissions...

Projects like gitea, use an action that emulates this github actions paths without such problems......
Not trivial

[cplee]

@panekj - can you add some notes to the description to document the intention of this PR? Also - what are your thoughts about the comment @ChristopherHX made regarding test-linux being a required check to merge?

[panekj]

what are your thoughts about the comment @ChristopherHX made regarding test-linux being a required check to merge?

It's possible that it might break and probably should be fixed. Other than that, I'm not touching Mergify since I don't know it and have no intention to figure out how it works.