ci: implements jenkins deploy

Dockerfile

@@ -0,0 +1,14 @@
+# Stage 1: build
+FROM node:20-alpine AS build
+WORKDIR /app
+COPY package*.json ./
+RUN npm install
+COPY . .
+RUN npm run build   # Esto genera /dist
+
+# Stage 2: serve con Nginx
+FROM nginx:alpine
+COPY --from=build /app/dist /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]