check installed docker version

.github/workflows/ci-cd.yml

@@ -26,6 +26,8 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v2
+    - name: Check Docker version
+      run: docker --version
     - name: Unset header
       # checkout@v2 adds a header that makes branch protection report errors
       # because the Github action bot is not a collaborator on the repo