attempt to create arm64 images

.github/workflows/build.yml

@@ -11,7 +11,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
 
       - name: Login to DockerHub
         uses: docker/login-action@v1
@@ -31,10 +34,11 @@ jobs:
             type=match,pattern=\d+.\d+
 
       - name: Build and push
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v5
         with:
           context: .
           push: true
+          platforms: linux/amd64,linux/arm64
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
 

Dockerfile

@@ -2,12 +2,14 @@ FROM golang:1.22.1
 
 ARG upx_version=4.2.2
 ARG GOPROXY
+ARG TARGETARCH
 
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
 # hadolint ignore=DL3008
 RUN apt-get update && apt-get install -y --no-install-recommends xz-utils && \
-  curl -Ls https://github.com/upx/upx/releases/download/v${upx_version}/upx-${upx_version}-amd64_linux.tar.xz -o - | tar xvJf - -C /tmp && \
-  cp /tmp/upx-${upx_version}-amd64_linux/upx /usr/local/bin/ && \
+  curl -Ls https://github.com/upx/upx/releases/download/v${upx_version}/upx-${upx_version}-${TARGETARCH}_linux.tar.xz -o - | tar xvJf - -C /tmp && \
+  cp /tmp/upx-${upx_version}-${TARGETARCH}_linux/upx /usr/local/bin/ && \
   chmod +x /usr/local/bin/upx && \
   apt-get remove -y xz-utils && \
   rm -rf /var/lib/apt/lists/*