feat: contextdata overlay api and more gh/gt instance flags

[ChristopherHX]

for github-act-runner

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ EDITORCONFIG	editorconfig-checker	8		0	0	0.16s
✅ REPOSITORY	gitleaks	yes		no	no	2.41s
✅ REPOSITORY	git_diff	yes		no	no	0.01s
✅ REPOSITORY	grype	yes		no	no	21.45s
✅ REPOSITORY	secretlint	yes		no	no	1.22s
✅ REPOSITORY	syft	yes		no	no	1.63s
✅ REPOSITORY	trivy-sbom	yes		no	no	3.16s
✅ REPOSITORY	trufflehog	yes		no	no	3.85s

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

Attention: Patch coverage is 91.04478% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pkg/runner/action_composite.go	0.00%	5 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ
cmd/input.go	88.46% <ø> (ø)
cmd/root.go	59.79% <100.00%> (+2.22%)	⬆️
pkg/runner/expression.go	78.91% <100.00%> (+0.19%)	⬆️
pkg/runner/run_context.go	80.57% <100.00%> (+0.14%)	⬆️
pkg/runner/runner.go	89.71% <100.00%> (+1.87%)	⬆️
pkg/runner/action_composite.go	87.95% <0.00%> (-2.86%)	⬇️

... and 14 files with indirect coverage changes

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