[Snyk] Security upgrade nginx from 1.26.1 to 1.28.1

[richard-vu]

Snyk has created this PR to fix 5 vulnerabilities in the dockerfile dependencies of this project.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Snyk changed the following file(s):

• docker-tutorial/02-unit/Dockerfile

We recommend upgrading to nginx:1.28.1, as this image has only 54 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	CVE-2025-27363 SNYK-DEBIAN12-FREETYPE-9402511	829
	CVE-2025-0838 SNYK-DEBIAN12-ABSEIL-8740787	714
	Integer Overflow or Wraparound SNYK-DEBIAN12-EXPAT-7855502	714
	Integer Overflow or Wraparound SNYK-DEBIAN12-EXPAT-7855503	714
	Integer Overflow or Wraparound SNYK-DEBIAN12-LIBAVIF-10180086	714

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Important

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

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🦉 Integer Overflow or Wraparound

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