build(docker): ensure user is non-root

[rsdmike]

No description provided.

[Copilot]

Pull request overview

Updates the runtime Docker image to run the Go console service as a non-root user in the final scratch stage.

Changes:

• Uses COPY --chown=65534:65534 for /tmp and /.config/device-management-toolkit.
• Sets USER 65534:65534 in the final image.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.70%. Comparing base (e16afa8) to head (d6a9bb9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #801   +/-   ##
=======================================
  Coverage   39.70%   39.70%           
=======================================
  Files         112      112           
  Lines       10673    10673           
=======================================
  Hits         4238     4238           
  Misses       6052     6052           
  Partials      383      383           

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