ci: fix install buildx

Author: fredleger

.github/workflows/__shared-ci.yml

@@ -136,6 +136,8 @@ jobs:
       - name: 📦 Install buildx
         run: |
           echo "+ install buildx"
+          set -x
+          mkdir -p ~/.docker/cli-plugins
           wget -O ~/.docker/cli-plugins/docker-buildx https://github.com/docker/buildx/releases/download/v0.12.1/buildx-v0.12.1.linux-amd64
           chmod a+x ~/.docker/cli-plugins/docker-buildx
           docker buildx create --name multiarch --use