adding validated services? patching forcad_local.py

OmCTF-2025/services/polyphonia/Dockerfile.frontend-builder

@@ -0,0 +1,13 @@
+FROM node:20.19.5-bookworm-slim AS frontend-builder
+
+WORKDIR /frontend
+
+COPY frontend/package*.json ./
+RUN npm install --no-audit --no-fund
+
+COPY frontend/ ./
+RUN npm run build
+
+
+FROM nginx:1.29.2-trixie
+COPY --from=frontend-builder /frontend/dist /frontend-dist