dockerize smtp-proxy (#118)

apps/smtp-server/Dockerfile

@@ -0,0 +1,45 @@
+# Stage 1: Build stage
+FROM node:20-alpine AS builder
+
+# Install pnpm (package manager) globally
+RUN npm install -g pnpm
+
+# Set working directory for the application
+WORKDIR /app
+
+# Copy configuration files first
+COPY package.json tsconfig.json tsup.config.ts ./
+
+# Install dependencies (including devDependencies)
+RUN pnpm install
+
+# Copy the source code
+COPY src/ ./src/
+
+# Build the application
+RUN pnpm run build
+
+
+# Remove development dependencies to reduce size
+RUN pnpm prune --prod
+
+# Stage 2: Production stage
+FROM node:20-alpine AS production
+
+# Set working directory in the final image
+WORKDIR /app
+
+# Copy necessary files from the builder stage: production node_modules, build output, and package definition
+COPY --from=builder /app/node_modules ./node_modules
+
+# Copy only the necessary files from builder
+COPY --from=builder /app/dist ./dist
+COPY --from=builder /app/package.json ./package.json
+
+
+# Expose SMTP ports (standard SMTP, SMTPS, and alternative ports)
+EXPOSE 25 465 587 2465 2587
+
+
+# Run the SMTP server
+CMD ["node", "dist/server.js"]