Enable overwrite of values in .env

[ncalteen]

This PR adds the overwrite configuration option when loading environment variables from the user's local .env file. This is restricted to the Node.js process @github/local-action runs in, so there is no risk of overwriting environment variables in the user's shell.

CC @githubdev58yashi

Closes #155

[Copilot]

PR Overview

This PR enables the overwrite of environment variables from the local .env file during the Node.js process execution.

• Enables overwriting by adding the "override" option in the dotenv configuration.
• Wraps the node_modules check in braces and introduces a commented placeholder for restoring environment variables.

Reviewed Changes

File	Description
src/commands/run.ts	Adds "override: true" to the dotenv config and updates error handling

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

src/commands/run.ts:64

• Ensure that the version of the dotenv library in use supports the 'override' option, otherwise this change might lead to unintended behavior.

override: true

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[github-actions]

🦙 MegaLinter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	4		0	0.07s
✅ JAVASCRIPT	prettier	11		0	1.08s
✅ JSON	npm-package-json-lint	yes		no	3.29s
✅ JSON	prettier	26		0	1.58s
✅ MARKDOWN	markdownlint	8		0	1.32s
✅ REPOSITORY	checkov	yes		no	26.52s
✅ REPOSITORY	gitleaks	yes		no	3.95s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	25.0s
✅ REPOSITORY	secretlint	yes		no	1.11s
❌ REPOSITORY	trivy	yes		1	13.53s
✅ REPOSITORY	trivy-sbom	yes		no	1.35s
✅ REPOSITORY	trufflehog	yes		no	30.1s
✅ TYPESCRIPT	prettier	70		0	4.48s
✅ YAML	prettier	22		0	0.91s
✅ YAML	yamllint	22		0	0.74s

See detailed report in MegaLinter reports

[Copilot]

PR Overview

This PR enables environment variable overwriting by adding a configuration option when loading variables from the local .env file.

• Adds an override: true option to the configuration call in the Node.js process.
• Restricts the overwrite behavior to the local action runtime.

Reviewed Changes

File	Description
src/commands/run.ts	Introduces the override: true configuration for env

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

src/commands/run.ts:64

• The property name 'override' in the config options is inconsistent with the PR title which refers to 'overwrite'. Consider renaming it to 'overwrite' for clarity and alignment with the PR intent.

override: true

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