Update Nginx to 1.27 and optimize apt-get cleanup

[RomuloGatto]

Description

Upgrades the final-stage base image from nginx:1.25.2 (August 2023) to nginx:1.27 and adds an apt-get upgrade step to pick up all available Debian 12 security patches at build time.

This resolves all fixable CVEs flagged by Wiz scanning, including 3 critical policy-failing vulnerabilities:

• CVE-2024-37371 (libkrb5/libk5crypto3) — unauthenticated remote code execution
• CVE-2024-45491 (libexpat1) — integer overflow
• CVE-2024-45492 (libexpat1) — integer overflow

Also fixes ~12 HIGH-severity CVEs across libkrb5, libexpat1, perl-base, libpam, libdav1d6, and libavif15.

Testing

• Rebuild the image and verify nginx starts correctly: docker build -t spicedb-playground . && docker run -p 3000:3000 spicedb-playground
• Re-run Wiz scan against the new image to confirm policy-failing CVEs are resolved
• Verify the playground loads correctly at localhost:3000

References

Wiz scan output for ghcr.io/authzed/spicedb-playground:v0.3.1 showing critical vulnerability policy failures

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[github-actions]

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[RomuloGatto]

I have read the CLA Document and I hereby sign the CLA

[RomuloGatto]

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