fix(docker): patch the base-OS pcre2 CVE in the nginx images - #33
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CVE-2026-103111 (HIGH, pcre2 out-of-bounds write) is present in nginx:1.31-alpine and fails the required Docker Build & Trivy Scan gate. The published nginx image still ships pcre2 10.48-r0 and the cached apk upgrade layer skips the fix, so require pcre2>=10.49-r0 explicitly in both nginx-based images (frontend and proxy). Generic apk upgrade is kept for the rest of the base OS.
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Problem
The required check Docker Build & Trivy Scan fails on every branch (including
main's next run) with:The nginx base image still ships
pcre2 10.48-r0, and the existingapk upgrade --no-cachelayer is served from the Docker build cache, so the OS patch is never applied on rebuilds.Fix
Require
pcre2>=10.49-r0explicitly in both nginx-based images (frontend and proxy). The genericapk upgrade --no-cachestays for the rest of the base OS. This also busts the stale cached layer.Verified locally: the built layer upgrades
pcre2 10.48-r0 -> 10.49-r0.Unrelated to the coverage work; split out so that PR stays focused.