Remove buildx build step as can curl pre-built

.gitlab-ci.yml

@@ -1,29 +1,7 @@
 stages:
-- buildx
 - build-dev
 - build-prod
 
-buildx:
-  image: docker:git
-  services:
-  - docker:dind
-  stage: buildx
-  rules:
-  - if: $CI_COMMIT_BRANCH == 'dev'
-  - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
-  variables:
-    GIT_STRATEGY: none
-  tags:
-  - docker
-  artifacts:
-    paths:
-      - buildx
-    expire_in: 1 hour
-  script:
-    - export DOCKER_BUILDKIT=1
-    - git clone git://github.com/docker/buildx ./docker-buildx
-    - docker build --platform=local -o . ./docker-buildx
-
 docker-build-dev:
   image: docker:latest
   services:
@@ -37,8 +15,15 @@ docker-build-dev:
   environment:
     name: development
   before_script:
-    - mkdir -p ~/.docker/cli-plugins
-    - mv buildx ~/.docker/cli-plugins/docker-buildx
+  - |
+    apk --no-cache add curl
+    latest_tag=$(curl -s https://api.github.com/repos/docker/buildx/releases/latest | sed -Ene '/^ *"tag_name": *"(v.+)",$/s//\1/p')
+    echo "Using buildx version $latest_tag"
+    curl -sSLo docker-buildx "https://github.com/docker/buildx/releases/download/$latest_tag/buildx-$latest_tag.linux-amd64"
+    chmod a+x docker-buildx
+    mkdir -p ~/.docker/cli-plugins
+    mv docker-buildx ~/.docker/cli-plugins/docker-buildx
+    docker version
   - docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
   - echo $CI_BUILD_TOKEN | docker login -u "$CI_REGISTRY_USER" --password-stdin $CI_REGISTRY
   script:
@@ -71,8 +56,15 @@ docker-build-prod:
   environment:
     name: production
   before_script:
-    - mkdir -p ~/.docker/cli-plugins
-    - mv buildx ~/.docker/cli-plugins/docker-buildx
+  - |
+    apk --no-cache add curl
+    latest_tag=$(curl -s https://api.github.com/repos/docker/buildx/releases/latest | sed -Ene '/^ *"tag_name": *"(v.+)",$/s//\1/p')
+    echo "Using buildx version $latest_tag"
+    curl -sSLo docker-buildx "https://github.com/docker/buildx/releases/download/$latest_tag/buildx-$latest_tag.linux-amd64"
+    chmod a+x docker-buildx
+    mkdir -p ~/.docker/cli-plugins
+    mv docker-buildx ~/.docker/cli-plugins/docker-buildx
+    docker version
   - docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
   - echo $CI_BUILD_TOKEN | docker login -u "$CI_REGISTRY_USER" --password-stdin $CI_REGISTRY
   script: