multi arch docker build

Dockerfile.multiarch

@@ -0,0 +1,15 @@
+FROM quay.io/prometheus/busybox:latest
+
+ARG TARGETPLATFORM
+ARG BUILDPLATFORM
+ARG TARGETOS
+ARG TARGETARCH
+
+LABEL maintainer="The Prometheus Authors <prometheus-developers@googlegroups.com>"
+
+# Copy the correct binary based on target architecture
+COPY .build/${TARGETOS}-${TARGETARCH}/node_exporter /bin/node_exporter
+
+EXPOSE      9100
+USER        nobody
+ENTRYPOINT  [ "/bin/node_exporter" ] 

build-multiarch.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+
+set -e
+
+echo "Building multi-architecture node_exporter with corrected approach..."
+
+# Create build directory
+mkdir -p .build
+
+# Build for Linux AMD64 using local cross-compilation
+echo "Building for linux/amd64..."
+GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o .build/linux-amd64/node_exporter .
+
+# Build for Linux ARM64 using local cross-compilation
+echo "Building for linux/arm64..."
+GOOS=linux GOARCH=arm64 CGO_ENABLED=0 go build -o .build/linux-arm64/node_exporter .
+
+# Create and use a new builder instance for multi-architecture builds
+echo "Setting up Docker Buildx..."
+docker buildx create --name multiarch-builder --use || true
+
+# Build multi-architecture image using buildx with the corrected Dockerfile
+echo "Building multi-architecture image with buildx..."
+docker buildx build \
+    --platform linux/amd64,linux/arm64 \
+    --tag ${AWS_ACCOUNT_ID}.dkr.ecr.${AWS_REGION}.amazonaws.com/${AWS_ECR_NAMESPACE}/node-exporter:multiarch \
+    --file Dockerfile.multiarch \
+    --push \
+    .
+
+echo ""
+echo "Multi-architecture build completed successfully!"
+echo ""
+echo "Generated binaries:"
+echo "  - .build/linux-amd64/node_exporter (Linux AMD64)"
+echo "  - .build/linux-arm64/node_exporter (Linux ARM64)"
+echo ""
+echo "Generated multi-architecture Docker image:"
+echo "  - ${AWS_ACCOUNT_ID}.dkr.ecr.${AWS_REGION}.amazonaws.com/${AWS_ECR_NAMESPACE}/node-exporter:multiarch (supports both AMD64 and ARM64)"
+echo ""
+echo "Architecture verification:"
+file .build/linux-amd64/node_exporter
+file .build/linux-arm64/node_exporter
+echo ""
+echo "To test the multi-architecture image:"
+echo "  docker pull ${AWS_ACCOUNT_ID}.dkr.ecr.${AWS_REGION}.amazonaws.com/${AWS_ECR_NAMESPACE}/node-exporter:multiarch"
+echo "  docker run --rm ${AWS_ACCOUNT_ID}.dkr.ecr.${AWS_REGION}.amazonaws.com/${AWS_ECR_NAMESPACE}/node-exporter:multiarch --version"