ci: add npmrc file for bkc

[rsdmike]

PR Checklist

• Unit Tests have been added for new changes
• API tests have been updated if applicable
• All commented code has been removed
• If you've added a dependency, you've ensured license is compatible with Apache 2.0 and clearly outlined the added dependency.

What are you changing?

Anything the reviewer should know when reviewing this PR?

If the there are associated PRs in other repositories, please link them here (i.e. device-management-toolkit/repo#365 )

[Copilot]

Pull request overview

This PR introduces an .npmrc configuration intended to enforce stricter npm install behavior (likely for CI/security baseline compliance) and updates the Docker build to use it during dependency installation.

Changes:

• Add a repository .npmrc with ignore-scripts, audit, and prefer-offline settings.
• Update the Dockerfile to copy .npmrc into the build stage and switch npm ci to --ignore-scripts.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
Dockerfile	Copies .npmrc into the builder stage and changes dependency install to npm ci --ignore-scripts.
.npmrc	Adds npm configuration impacting installs (scripts/audit/cache behavior).

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