fix: Update busybox to address security vulnerability

[asitsonawane]

PR Template

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Proposed Changes

This PR addresses a security vulnerability identified in the busybox package (version 1.36.1-r15) used in our Docker image. The vulnerability was reported by Docker Scout. To mitigate this, we update the busybox package to the latest version by including apk update && apk upgrade busybox in the Dockerfile.

The rest of the Dockerfile steps remain unchanged, ensuring that the installation and configuration of nginx and its modules continue as intended.

Link to GitHub issue: [Insert link here, if applicable]

Checklist

Before creating a PR, run through this checklist and mark each as complete:

• [x] I have read the CONTRIBUTING document
• [x] I have run ./update.sh and ensured all entrypoint/Dockerfile template changes have been applied to the relevant image entrypoint scripts & Dockerfiles
• [ ] If applicable, I have added tests that prove my fix is effective or that my feature works
• [x] If applicable, I have checked that any relevant tests pass after adding my changes
• [x] I have updated any relevant documentation