build: ensure stale content does not get copied into container

[rsdmike]

device-management-toolkit/console#684

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 updates the container build process to avoid accidentally packaging stale Angular build artifacts (e.g., dist/ or ui/) that may exist in the Docker build context, and ensures enterprise builds can have their API placeholder replaced at runtime.

Changes:

• Extend init.sh to replace the ##CONSOLE_SERVER_API## placeholder used by the enterprise environment configuration.
• Adjust the Docker build artifact selection logic to prefer the ui/browser output (enterprise) before falling back to dist/samplewebui/browser.
• Add dist/, ui/, coverage/, and .angular/ to .dockerignore to prevent old build outputs/caches from being copied into the image build context.

Reviewed changes

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

File	Description
init.sh	Adds runtime placeholder substitution for ##CONSOLE_SERVER_API## in built JS bundles.
Dockerfile	Prefer ui/browser over dist/samplewebui/browser when selecting the build output to package.
.dockerignore	Excludes common build outputs/caches from Docker context to prevent stale artifacts being packaged.