[Snyk] Security upgrade nginx from 1.26.1 to 1.29.3

[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:1.29.3, as this image has only 53 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
	Integer Overflow or Wraparound SNYK-DEBIAN12-AOM-7197979	714
	Integer Overflow or Wraparound SNYK-DEBIAN12-LIBAVIF-10180086	714
	Expired Pointer Dereference SNYK-DEBIAN12-LIBXML2-10350658	714
	Out-of-bounds Read SNYK-DEBIAN12-LIBXML2-10350668	714

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Pull Request Overview

This PR attempts to upgrade the nginx base image from version 1.26.1 to 1.29.3 to address 5 security vulnerabilities (4 critical, 1 high severity) in the Docker container dependencies.

Key Changes:

• Updates the nginx base image version in the Dockerfile from 1.26.1 to 1.29.3

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