deploy success - first version successed

backend/Dockerfile

@@ -7,6 +7,14 @@ RUN npm install
 
 COPY . .
 
+# Expose API port and SMTP port
 EXPOSE 5182
+EXPOSE 25
+
+# Environment variables for database connection will be passed at runtime
+# ENV DB_HOST=...
+# ENV DB_USER=...
+# ENV DB_PASSWORD=...
+# ENV DB_NAME=...
 
 CMD [ "node", "app.js" ]