Update Dockerfile for arm64 build support on export feature (#251)

backend/Dockerfile

@@ -1,33 +1,63 @@
+# Stage 1: build codepair backend
+# Start from the node base image
 FROM node:alpine3.18 AS builder
+
+# Set the Current Working Directory inside the container
 WORKDIR /app
+
+# Copy the source from the current directory to the Working Directory inside the container
 COPY . .
-# Dependency for Prisma
+
+# Download dependency for Prisma
 RUN apk upgrade --update-cache --available && \
     apk add openssl && \
     rm -rf /var/cache/apk/*
+
+# Download dependencies for Puppeteer
+RUN apk add --no-cache \
+    chromium \
+    nss \
+    freetype \
+    harfbuzz \
+    ca-certificates \
+    ttf-freefont
+
+# Install dependencies
 RUN npm ci
+
+# Build codepair backend
 RUN npm run build
 
+# Stage 2: copy build outputs and dependencies for actual image
 FROM node:alpine3.18
+
+# Set the Current Working Directory inside the container
 WORKDIR /app
-ENV NODE_ENV production
+
+# Get and copy the build outputs from the builder stage
 COPY --from=builder /app ./
-# Dependency for Prisma
+
+# Download dependency for Prisma
 RUN apk upgrade --update-cache --available && \
     apk add openssl && \
     rm -rf /var/cache/apk/*
 
-# # Dependency for Puppeteer
-# RUN apk add --no-cache \
-#     chromium \
-#     nss \
-#     freetype \
-#     harfbuzz \
-#     ca-certificates \
-#     ttf-freefont
+# Download dependencies for Puppeteer
+RUN apk add --no-cache \
+    chromium \
+    nss \
+    freetype \
+    harfbuzz \
+    ca-certificates \
+    ttf-freefont
 
-# ENV PUPPETEER_SKIP_CHROMIUM_DOWNLOAD true
-# ENV PUPPETEER_EXECUTABLE_PATH /usr/bin/chromium-browser
+# Set the environment variables
+ENV NODE_ENV production
+ENV PUPPETEER_SKIP_CHROMIUM_DOWNLOAD true
+ENV PUPPETEER_EXECUTABLE_PATH /usr/bin/chromium-browser
 
+# Expose port 3000 to the outside world
 EXPOSE 3000
+
+# Run the backend server
 CMD ["npm", "run", "start:prod"]