chore: frontend docker setup

.dockerignore en .dockerfile van de frontend ingesteld

frontend/.dockerignore

@@ -0,0 +1,7 @@
+**/node_modules/
+**/dist
+.git
+npm-debug.log
+.coverage
+.coverage.*
+.env

frontend/frontend.dockerfile

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+# build stage
+FROM node:22 as build-stage
+WORKDIR /app
+COPY package*.json ./
+RUN npm install
+COPY . .
+RUN npm run build
+
+# production stage
+FROM nginx:stable as production-stage
+COPY --from=build-stage /app/dist /usr/share/nginx/html
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]