Update Node.js version to 24-alpine (#77)

* Update Node.js version to 24-alpine

* Change CMD to run app.js with node

* Implement multi-stage build in Dockerfile

Refactor Dockerfile to use multi-stage builds for better optimization and separation of build and production environments.

---------

Co-authored-by: Stefano Germano <2128484+stefanogermano@users.noreply.github.com>

Author: markducks

Dockerfile

@@ -1,8 +1,24 @@
-FROM node:20-alpine
+# Stage 1: Build
+FROM node:24-alpine AS builder
 WORKDIR /app
+COPY package*.json ./
+RUN npm ci
 COPY . .
 
-RUN npm install 
+# Stage 2: Production
+FROM node:24-alpine
+WORKDIR /app
+
+COPY --from=builder /app ./
+
+# Install only production dependencies
+RUN npm ci --omit=dev
 
-CMD npm start
+# Get version from package.json and set as label
+ARG APP_VERSION
+LABEL org.opencontainers.image.version="${APP_VERSION}"
+LABEL org.opencontainers.image.title="LoIDE-API-Server"
+LABEL org.opencontainers.image.description="An API server for LoIDE clients"
+LABEL org.opencontainers.image.source="https://github.com/DeMaCS-UNICAL/LoIDE-API-Server"
 
+CMD ["node", "app.js"]