use arm64 in github actions to build django image

Author: Tony Qiu

.github/workflows/deploy-backend.yml

@@ -37,11 +37,14 @@ jobs:
         id: login-ecr
         uses: aws-actions/amazon-ecr-login@v2
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Build Docker image
         run: |
           IMAGE_URI=${ECR_REGISTRY}/${ECR_REPOSITORY}:${IMAGE_TAG}
-          echo "Building ${IMAGE_URI}"
-          docker build -f backend/Dockerfile -t ${IMAGE_URI} backend
+          echo "Building ${IMAGE_URI} for ARM64"
+          docker buildx build --platform linux/arm64 -f backend/Dockerfile -t ${IMAGE_URI} --load backend
 
       - name: Push Docker image
         run: |

backend/Dockerfile

@@ -1,6 +1,5 @@
 # Use official Python runtime as base image
-# Use ARM64 architecture (native for M4 Mac Mini)
-FROM --platform=linux/arm64 python:3.11-slim
+FROM python:3.11-slim
 
 # Set environment variables
 ENV PYTHONUNBUFFERED=1 \
@@ -21,16 +20,11 @@ RUN pip install -r requirements.txt
 COPY . .
 
 # Copy and set up entrypoint script
-COPY docker-entrypoint.sh /usr/local/bin/docker-entrypoint.sh
-RUN chmod +x /usr/local/bin/docker-entrypoint.sh && \
-    # Ensure Unix line endings and verify the script
-    sed -i 's/\r$//' /usr/local/bin/docker-entrypoint.sh && \
-    ls -la /usr/local/bin/docker-entrypoint.sh && \
-    head -1 /usr/local/bin/docker-entrypoint.sh
+COPY docker-entrypoint.sh /usr/local/bin/
+RUN chmod +x /usr/local/bin/docker-entrypoint.sh
 
 # Expose port
 EXPOSE 3000
 
 # Use entrypoint script
-ENTRYPOINT ["docker-entrypoint.sh"]
-
+ENTRYPOINT ["/usr/local/bin/docker-entrypoint.sh"]