use API_PORT instead of EMS_PORT for NestJS backend

server/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:lts-alpine AS base
+FROM node:20 AS base
 
 FROM base AS builder
 
@@ -6,12 +6,12 @@ WORKDIR /app
 
 COPY package*.json ./
 
-RUN npm ci
+RUN npm install
 
 COPY . .
 
 RUN npm run build
 
-EXPOSE $EMS_PORT
+EXPOSE $API_PORT
 
 CMD ["node", "dist/main"]