Potential fixes for 2 code scanning alerts

[cinderellasecure]

As part of the organization's transition to default read-only permissions for the GITHUB_TOKEN, this pull request addresses a missing permission in the workflow that triggered a code scanning alert.

This PR explicitly adds the required read permissions to align with the default read only permission and is part of a larger effort for this OKR https://github.com/github/security-services/issues/455

Potential fixes for 2 code scanning alerts from the Copilot AutoFix: Missing Permissions in Workflows security campaign:

• https://github.com/github/details-menu-element/security/code-scanning/5 The best way to fix this issue is to add a permissions block either at the root of the workflow or within the specific job (publish-npm). The block should minimally allow only what is strictly required. Since this workflow reads code (via actions/checkout) and publishes to npm (which does not require GitHub repository writes), the best principle of least privilege setting is contents: read, unless there is a need for additional tokens (which isn't shown here). Any future needs for additional scopes can be added granularly. The change should be applied at either the root (top) of the workflow (line 2) or within the job definition at line 9, but root is preferred for clarity and ensuring coverage of all jobs.

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• https://github.com/github/details-menu-element/security/code-scanning/4 The best way to fix this problem is to explicitly add a permissions block at the workflow root, above the jobs section in .github/workflows/nodejs.yml. This block should set the minimum required permissions for CI: contents: read. This change limits the permissions granted to the GITHUB_TOKEN for all jobs unless a job or step has a more specific (write) permission set later. This prevents accidental escalation of privileges and aligns the workflow with the principle of least privilege. No imports, definitions, or other code changes are needed; simply add the following block under the workflow name and before on: or jobs::

  permissions:
  contents: read
  

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