update docker for mono repo

.build/prod/.env.example

@@ -0,0 +1,6 @@
+VITE_API_TARGET=http://localhost:8080/
+
+# Base path the client calls. Leave as /api to use the dev proxy (same-origin,
+# no CORS). For a production build served on a different origin than the API,
+# set this to the API's absolute URL, e.g. https://radapi.example.com
+VITE_API_BASE=/api

.build/prod/README.md

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+
+## Production deployment
+it is assumed that you will be using backend on the same machine, so this compose is for both services
+```yml
+services:
+   frontend:
+      hostname: frontend
+      image: git.shihaam.dev/sarlink/radui
+      ports: 
+       - 8000:80
+   backend:
+      hostname: backend
+      image: git.shihaam.dev/sarlink/radapi
+      ports: 
+       - 8001:80
+```

.build/prod/compose.yml

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+services:
+   frontend:
+      build:
+        context: ../../frontend
+        dockerfile: .build/prod/frontend.Dockerfile
+        args:
+          VITE_API_TARGET: ${VITE_API_TARGET}
+      hostname: frontend
+      image: git.shihaam.dev/sarlink/radui

.build/prod/frontend.Dockerfile

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+FROM node:22.17.0-alpine AS frontendbuilder
+
+ARG VITE_API_TARGET
+
+WORKDIR /var/www/html
+COPY . .
+RUN echo VITE_API_TARGET=$VITE_API_TARGET > .env \
+ && npm ci && npm run build
+
+FROM nginx
+
+COPY --from=frontendbuilder /var/www/html/dist /usr/share/nginx/html