update builder script

Makefile

@@ -20,7 +20,7 @@ PLATFORMS ?= linux/amd64
 # Alternatively, you can export the PLATFORMS variable like this:
 # export PLATFORMS=linux/arm64,linux/s390x,linux/amd64
 ARCH := $(shell uname -m | sed 's/x86_64/amd64/')
-DOCKER_BUILDER ?= docker-builder
+DOCKER_BUILDER ?= cnao-docker-builder
 OPERATOR_IMAGE_TAGGED := $(IMAGE_REGISTRY)/$(OPERATOR_IMAGE):$(IMAGE_TAG)
 NULL  :=
 SPACE := $(NULL) #

hack/build-multiarch-operator.sh

@@ -1,10 +1,13 @@
 #!/bin/bash
 
 check_buildx() {
-  if ! docker buildx version > /dev/null 2>&1; then
-    echo "Docker Buildx is not installed or not available."
-    echo "Please ensure Docker 19.03+ and Buildx is available."
-    exit 1
+  export DOCKER_CLI_EXPERIMENTAL=enabled
+
+  # If there is no buildx let's install it
+  if ! docker buildx > /dev/null 2>&1; then
+     mkdir -p ~/.docker/cli-plugins
+     curl -L https://github.com/docker/buildx/releases/download/v0.6.3/buildx-v0.6.3.linux-amd64 --output ~/.docker/cli-plugins/docker-buildx
+     chmod a+x ~/.docker/cli-plugins/docker-buildx
   fi
 }