🔒️(docker) patch libssl3 and libcrypto3 to address CVE-2024-12797

Added temporary root privileges to update OpenSSL libraries. Upgrades libssl3
and libcrypto3 to 3.3.3-r0 to fix HIGH severity vulnerability. Properly
switches back to nginx user after updates. Maintains unprivileged execution
while addressing security concern affecting RFC7250 Raw Public Keys
authentication.

Security: CVE-2024-12797

src/frontend/Dockerfile

@@ -34,6 +34,11 @@ RUN npm run build
 # ---- Front-end image ----
 FROM nginxinc/nginx-unprivileged:1.26-alpine AS frontend-production
 
+USER root
+RUN apk update && apk upgrade libssl3 libcrypto3
+
+USER nginx
+
 # Un-privileged user running the application
 ARG DOCKER_USER
 USER ${DOCKER_USER}