build: setup docker buildx

Signed-off-by: Morlay <morlay.null@gmail.com>

scripts/travis/setup-docker-buildx.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+
+DOCKER_BUILDX_VERSION=v0.4.1
+LOCAL_OS=$(uname -s | tr '[A-Z]' '[a-z]')
+
+case $(uname -m) in
+x86_64)
+  LOCAL_ARCH=amd64
+  ;;
+aarch64)
+  LOCAL_ARCH=arm64
+  ;;
+*)
+  echo "unsupported architecture"
+  exit 1
+  ;;
+esac
+
+if [[ ! -f ~/.docker/cli-plugins/docker-buildx ]]; then
+  DOCKER_BUILDX_DOWNLOAD_URL=https://github.com/docker/buildx/releases/download/${DOCKER_BUILDX_VERSION}/buildx-${DOCKER_BUILDX_VERSION}.${LOCAL_OS}-${LOCAL_ARCH}
+  mkdir -p ~/.docker/cli-plugins
+  echo "downloading from ${DOCKER_BUILDX_DOWNLOAD_URL}"
+  curl -sL --output ~/.docker/cli-plugins/docker-buildx "${DOCKER_BUILDX_DOWNLOAD_URL}"
+  chmod +x ~/.docker/cli-plugins/docker-buildx
+fi
+
+# checkout buildx available
+docker buildx version
+
+# enabled qemu if needed
+if [[ ! $(docker buildx inspect default | grep Platforms) == *arm64* ]]; then
+  docker run --rm --privileged multiarch/qemu-user-static --reset -p
+fi
+
+# setup builder if need
+if [[ ! $(docker buildx inspect builder) == *"Name"* ]]; then
+  docker buildx create --use --name=builder --platform=linux/amd64,linux/arm64 --driver-opt=image=moby/buildkit:master,network=host
+fi