feat: deploy to Frostmoln production

Replace the AWS deploy-prod job (failing since CI left AWS) with deploy-prod-frostmoln, and run under the restricted Pod Security profile with the namespace's oci-registry pull secret.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01H6eVuR4Yt3m7TbDTDwyZJi

Dockerfile

@@ -12,7 +12,7 @@ COPY . /build
 RUN npm run postinstall && npm run generate && npm run lint
 #RUN yarn start:ci & yarn wait && yarn test:cypress
 
-FROM amd64/nginx:1.31.7@sha256:227f31dac037a2f1cdbd17ca9eec940a76c6c1b3187f5285eca2c3edb5d19c31
+FROM nginxinc/nginx-unprivileged:1.31.7@sha256:94193d5c4c5df716f412bb08eb97956d98fe6b59886f0bc57d6d3a3402a88a02
 MAINTAINER Joakim Olsson <joakim@unbound.se>
 
 COPY --from=builder /build/.output/public/ /usr/share/nginx/html/