further ci trials

.travis.yml

@@ -5,19 +5,25 @@ arch:
   - amd64
   - arm64
 
-#env:
+env:
+  global:
+    - DOCKER_CLI_EXPERIMENTAL=enabled
+#  jobs:
 #    - DOCKER_BUILD_PLATFORM=linux/amd64,linux/arm/v7,linux/arm64
 #    - DOCKER_BUILD_PLATFORM=linux/arm/v7
 #    - DOCKER_BUILD_PLATFORM=linux/arm64
 #    - FOO=bar BAR=baz
 
+# uname -m
+#  aarch64
+#  x86_64
+#  armv7l
 before_install:
   - uname -a
-  - curl -fsSL https://get.docker.com | sh
-  - echo '{"experimental":"enabled"}' | sudo tee /etc/docker/daemon.json
-  - mkdir -p $HOME/.docker
-  - echo '{"experimental":"enabled"}' | sudo tee $HOME/.docker/config.json
-  - sudo service docker start
+  - export ARCH=$([ $(uname -m) = "x86_64" ] && echo "amd64" || echo "arm64")
+  - mkdir -p ~/.docker/cli-plugins/
+  - wget -O ~/.docker/cli-plugins/docker-buildx https://github.com/docker/buildx/releases/download/v0.3.1/buildx-v0.3.1.linux-${ARCH}
+  - chmod a+x ~/.docker/cli-plugins/docker-buildx
   - docker info
 install:
   - docker run --rm --privileged multiarch/qemu-user-static --reset -p yes