Update ci.yml

Author: mtrezza

.github/workflows/ci.yml

@@ -85,6 +85,8 @@ jobs:
     timeout-minutes: 5
     runs-on: ubuntu-18.04
     steps:
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
       - uses: actions/checkout@v2
       - name: Check NPM lock file version
         uses: mansona/npm-lockfile-version@v1