feat: install buildx plugin in dind runner

runner/Dockerfile.dindrunner

@@ -3,7 +3,8 @@ FROM ubuntu:20.04
 ARG TARGETPLATFORM
 ARG RUNNER_VERSION=2.280.3
 ARG DOCKER_CHANNEL=stable
-ARG DOCKER_VERSION=19.03.13
+ARG DOCKER_VERSION=20.10.8
+ARG DOCKER_BUILDX_VERSION=0.6.3
 ARG DUMB_INIT_VERSION=1.2.5
 
 RUN test -n "$TARGETPLATFORM" || (echo "TARGETPLATFORM must be set" && false)
@@ -71,6 +72,14 @@ RUN export ARCH=$(echo ${TARGETPLATFORM} | cut -d / -f2) \
 		--directory /usr/local/bin/ \
 	; \
 	rm docker.tgz; \
+    mkdir -p /home/runner/.docker/cli-plugins; \
+    export BUILDX_ARCH=$(echo ${TARGETPLATFORM} | cut -d / -f2); \
+    if ! curl -L -o /home/runner/.docker/cli-plugins/docker-buildx "https://github.com/docker/buildx/releases/download/v${DOCKER_BUILDX_VERSION}/buildx-v${DOCKER_BUILDX_VERSION}.linux-${BUILDX_ARCH}"; then \
+        echo >&2 "error: failed to download docker-buildx v${DOCKER_VERSION}'"; \
+        exit 1; \
+    fi; \
+    chown -R runner:docker /home/runner/.docker; \
+    chmod +x /home/runner/.docker/cli-plugins/docker-buildx; \
 	dockerd --version; \
 	docker --version
 

runner/Makefile

@@ -5,6 +5,7 @@ TARGET_PLATFORM ?= $(shell arch)
 
 RUNNER_VERSION ?= 2.280.3
 DOCKER_VERSION ?= 20.10.8
+DOCKER_BUILDX_VERSION ?= 0.6.3
 
 # default list of platforms for which multiarch image is built
 ifeq (${PLATFORMS}, )
@@ -15,7 +16,7 @@ endif
 ifeq (${IMG_RESULT}, load)
 	export PUSH_ARG="--load"
     # if load is specified, image will be built only for the build machine architecture.
-    export PLATFORMS="local"
+    #export PLATFORMS="local"
 else ifeq (${IMG_RESULT}, cache)
 	# if cache is specified, image will only be available in the build cache, it won't be pushed or loaded
 	# therefore no PUSH_ARG will be specified
@@ -25,7 +26,7 @@ endif
 
 docker-build-ubuntu:
 	docker build --build-arg TARGETPLATFORM=${TARGET_PLATFORM} --build-arg RUNNER_VERSION=${RUNNER_VERSION} --build-arg DOCKER_VERSION=${DOCKER_VERSION} -t ${NAME}:${TAG} .
-	docker build --build-arg TARGETPLATFORM=${TARGET_PLATFORM} --build-arg RUNNER_VERSION=${RUNNER_VERSION} --build-arg DOCKER_VERSION=${DOCKER_VERSION} -t ${DIND_RUNNER_NAME}:${TAG} -f Dockerfile.dindrunner .
+	docker build --build-arg TARGETPLATFORM=${TARGET_PLATFORM} --build-arg RUNNER_VERSION=${RUNNER_VERSION} --build-arg DOCKER_VERSION=${DOCKER_VERSION} --build-arg DOCKER_BUILDX_VERSION=${DOCKER_BUILDX_VERSION} -t ${DIND_RUNNER_NAME}:${TAG} -f Dockerfile.dindrunner .
 
 docker-push-ubuntu:
 	docker push ${NAME}:${TAG}
@@ -45,6 +46,7 @@ docker-buildx-ubuntu:
 	docker buildx build --platform ${PLATFORMS} \
 		--build-arg RUNNER_VERSION=${RUNNER_VERSION} \
 		--build-arg DOCKER_VERSION=${DOCKER_VERSION} \
+		--build-arg DOCKER_BUILDX_VERSION=${DOCKER_BUILDX_VERSION} \
 		-t "${DIND_RUNNER_NAME}:latest" \
 		-f Dockerfile.dindrunner \
 		. ${PUSH_ARG}