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taylanbakircioglu d5f9b1833d fix(nginx): pin all nginx images to patched 1.31.1-alpine (poolslip advisory)
The frontend image was flagged on nginx 1.31.0 because the Dockerfiles
used the floating nginx:alpine (mainline) tag. No rewrite directives
exist in any nginx config, so the named-capture mitigation does not
apply; the remediation is the version update.

Pin every nginx reference to the patched 1.31.1-alpine release:
- frontend/Dockerfile, Dockerfile.production, Dockerfile.simple
- deployment/local-test/14-nginx-proxy.yaml (was nginx:alpine)
- deployment/local-test/l7-sample-apps.yaml (was nginx:1.25-alpine)

Validated with `nginx -t` on 1.31.1 for all configs.
2026-06-02 15:07:05 +03:00
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