multi-platform Containerfile and remove QEMU

Signed-off-by: Joseph <[email protected]>

Author: Joeavaikath

.github/workflows/quay_binaries_push.yml

@@ -27,11 +27,6 @@ jobs:
         with:
           go-version-file: go.mod
           cache: true
-
-      - name: Install qemu dependency
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y qemu-user-static
 
       - name: Build Image for ${{ matrix.arch }}
         id: build_image

Containerfile.download

@@ -1,7 +1,10 @@
 # This Dockerfile is used to cross-build the kubectl-oadp binaries for all platforms
 # It also builds a Go server that serves the binaries for download
 
-FROM golang:1.24 AS builder
+FROM --platform=$BUILDPLATFORM golang:1.24 AS builder
+
+ARG TARGETOS
+ARG TARGETARCH
 
 WORKDIR /app
 
@@ -10,16 +13,22 @@ RUN go mod download && go mod verify
 
 COPY . .
 
-# Build everything, create tarballs, and clean up in one layer to reduce size
+# Build ALL kubectl-oadp binaries using native Go cross-compilation (no QEMU emulation)
+# The download server needs to serve binaries for all platforms, not just one arch
 RUN make release-build && \
-    CGO_ENABLED=0 go build -o download-server ./cmd/downloads/server.go && \
     mkdir -p /archives && \
     for binary in kubectl-oadp_*; do \
         archive_name=$(echo "$binary" | sed 's/\.exe$//' ).tar.gz; \
         tar -czf "/archives/$archive_name" "$binary"; \
         echo "Created /archives/$archive_name"; \
-    done && \
-    go clean -cache -modcache -testcache && \
+    done
+
+# Build the download server for the TARGET platform (the arch this container will run on)
+# This uses cross-compilation so the builder can run natively on amd64
+RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -o download-server ./cmd/downloads/server.go
+
+# Clean up to reduce layer size
+RUN go clean -cache -modcache -testcache && \
     rm -rf /root/.cache/go-build && \
     rm -rf /go/pkg