Docker build fails on Apple Silicon due to CGO + amd64 mismatch (gcc -m64 error)

[Tibinsunny]

Description

Docker build fails when building the backend with CGO enabled on Apple Silicon machines.Tested on M4

The failure occurs during go build with the following error:

gcc: error: unrecognized command-line option '-m64'

Steps to Reproduce

1. Build the Docker image on an Apple Silicon machine (arm64)
2. Use the current Dockerfile/backend build stage
3. Build reaches the Go compile step with CGO enabled

Build Command Used

CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go build -o <binary> main.go

Error Output

# runtime/cgo
gcc: error: unrecognized command-line option '-m64'

Root Cause (Analysis)

• Alpine pulls an arm64 base image on Apple Silicon by default
• GOARCH=amd64 forces Go to target amd64
• gcc inside the container is arm64
• This causes CGO to pass -m64, which arm64 gcc does not support