.travis.yml in r10k-3.8.0 vs .travis.yml in r10k-3.9.0

@@ -27,19 +27,26 @@
       language: ruby
       services:
         - docker
       rvm: 2.6.6
       env:
-        - DOCKER_COMPOSE_VERSION=1.25.5
+        - DOCKER_COMPOSE_VERSION=1.28.6
+        - DOCKER_BUILDX_VERSION=0.5.1
         # necessary to prevent overwhelming TravisCI build output limits
         - DOCKER_BUILD_FLAGS="--progress plain"
       before_install:
         - sudo rm /usr/local/bin/docker-compose
         - curl --location https://github.com/docker/compose/releases/download/${DOCKER_COMPOSE_VERSION}/docker-compose-`uname --kernel-name`-`uname --machine` > docker-compose
         - chmod +x docker-compose
         - sudo mv docker-compose /usr/local/bin
+        - mkdir -vp ~/.docker/cli-plugins
+        - curl --location https://github.com/docker/buildx/releases/download/v${DOCKER_BUILDX_VERSION}/buildx-v${DOCKER_BUILDX_VERSION}.linux-amd64 > ~/.docker/cli-plugins/docker-buildx
+        - chmod +x ~/.docker/cli-plugins/docker-buildx
+        - docker buildx create --name travis_builder --use
       script:
         - set -e
         - cd docker
         - make lint
         - make build
         - make test
+      after_script:
+        - docker buildx rm travis_builder