Create Dockerfile

Dockerfile

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+# Use Node.js LTS version
+FROM node:18-slim
+
+# Create app directory
+WORKDIR /usr/src/app
+
+# Install dependencies directly
+RUN npm init -y && \
+    npm install express body-parser nodemailer
+
+# Copy application code
+COPY recharge.js .
+
+# Expose the port the app runs on
+EXPOSE 3000
+
+# Command to run the application
+CMD [ "node", "recharge.js" ]