fix: runs-on expression per matrix has different results

[ChristopherHX]

Do not evaluate inplace

Maybe we should just store such a copy in RunContext

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ EDITORCONFIG	editorconfig-checker	9		0	0	0.17s
✅ REPOSITORY	gitleaks	yes		no	no	2.23s
✅ REPOSITORY	git_diff	yes		no	no	0.01s
✅ REPOSITORY	grype	yes		no	no	22.79s
✅ REPOSITORY	secretlint	yes		no	no	1.19s
✅ REPOSITORY	syft	yes		no	no	1.39s
✅ REPOSITORY	trivy-sbom	yes		no	no	3.02s
✅ REPOSITORY	trufflehog	yes		no	no	3.74s

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