Add Support for @actions/artifact

[ncalteen]

This PR introduces support for stubbing the functionality of the @actions/artifact package. This is accomplished via the following:

• Copies all required components of the @actions/artifact package.
• Adds a new environment variable, LOCAL_ACTION_ARTIFACT_PATH, which can be used to set the local directory where @actions/artifact will "upload" and "download" artifacts.
• Adds a check for the LOCAL_ACTION_ARTIFACT_PATH environment variable whenever @actions/artifact operations are performed.
• Adds new properties to environment metadata for tracking artifacts that have been created as part of a local-action run (currently no cleanup of those artifacts is performed).

Important

Operations on artifacts in external repositories is left implemented as-is. If you specify the findBy options as noted here, the corresponding GitHub API will be called.

[Copilot]

Copilot reviewed 30 out of 45 changed files in this pull request and generated no comments.

Files not reviewed (15)

• .env.example: Language not supported
• tests/stubs/artifact/internal/delete/delete-artifact.test.ts: Evaluated as low risk
• tests/commands/run.test.ts: Evaluated as low risk
• tests/stubs/core-stubs.test.ts: Evaluated as low risk
• tests/command.test.ts: Evaluated as low risk
• tests/utils/output.test.ts: Evaluated as low risk
• tests/index.test.ts: Evaluated as low risk
• tests/stubs/summary-stubs.test.ts: Evaluated as low risk
• tests/stubs/env-stubs.test.ts: Evaluated as low risk
• tests/stubs/artifact/internal/upload/upload-artifact.test.ts: Evaluated as low risk
• docs/supported-functionality.md: Evaluated as low risk
• tests/stubs/artifact/internal/client.test.ts: Evaluated as low risk
• fixtures/stream/promises.ts: Evaluated as low risk
• fixtures/fs.ts: Evaluated as low risk
• fixtures/crypto.ts: Evaluated as low risk

Comments suppressed due to low confidence (1)

tests/stubs/artifact/internal/find/list-artifacts.test.ts:12

• [nitpick] The function name 'listArtifactsInternal' is ambiguous. Consider renaming it to 'listEnvArtifacts' to indicate that it lists artifacts from the environment metadata.

describe('list-artifacts', () => {

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[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	4		0	0.04s
✅ JAVASCRIPT	prettier	11		0	1.21s
✅ JSON	jsonlint	23		0	0.52s
✅ JSON	npm-package-json-lint	yes		no	1.2s
✅ JSON	prettier	23		0	1.48s
✅ MARKDOWN	markdownlint	8		0	3.12s
✅ REPOSITORY	checkov	yes		no	24.51s
✅ REPOSITORY	gitleaks	yes		no	2.67s
✅ REPOSITORY	git_diff	yes		no	0.03s
✅ REPOSITORY	grype	yes		no	17.55s
✅ REPOSITORY	secretlint	yes		no	0.97s
✅ REPOSITORY	trivy	yes		no	11.97s
✅ REPOSITORY	trivy-sbom	yes		no	0.94s
✅ REPOSITORY	trufflehog	yes		no	28.14s
✅ TYPESCRIPT	prettier	56		0	4.19s
✅ YAML	prettier	21		0	1.66s
✅ YAML	yamllint	21		0	1.0s

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