variables de entorno, correcciones de codigo actual, docker file

Dockerfile

@@ -0,0 +1,23 @@
+# Etapa de construcción
+FROM node:22-alpine AS builder
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm install
+
+COPY . .
+RUN npm run build
+
+# Etapa de producción
+FROM node:20-alpine AS production
+
+WORKDIR /app
+
+COPY --from=builder /app/node_modules ./node_modules
+COPY --from=builder /app/dist ./dist
+COPY --from=builder /app/package*.json ./
+
+EXPOSE 4100
+
+CMD ["node", "dist/main"]