chore: Upgrade NGINX base image to version 1.28.3-8-azl3.0.20260722

[KanchanN-Microsoft]

Purpose

This pull request updates the NGINX base image version used in the src/ContentProcessorWeb/Dockerfile for serving the application. The new version is more recent and may include security patches and performance improvements.

Dependency update:

• Updated the NGINX base image from 1.25 to 1.28.3-8-azl3.0.20260722 in src/ContentProcessorWeb/Dockerfile to ensure the application uses the latest available NGINX image.

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

• ...

Other Information

[Copilot]

Pull request overview

This PR updates the NGINX base image used to serve the built React app in src/ContentProcessorWeb/Dockerfile, aligning the runtime container with a newer Azure Linux NGINX image release.

Changes:

• Upgraded the Stage 2 runtime image from mcr.microsoft.com/azurelinux/base/nginx:1.25 to mcr.microsoft.com/azurelinux/base/nginx:1.28.3-8-azl3.0.20260722.

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