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 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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