Fixups in ci

.github/workflows/tests.yml

@@ -13,11 +13,25 @@ jobs:
     steps:
     - name: Checkout code
       uses: actions/checkout@v2
-    - uses: docker-practice/actions-setup-docker@master
-      timeout-minutes: 12
     - run: |
         set -x
 
+        for pkg in docker.io docker-doc docker-compose docker-compose-v2 podman-docker containerd runc; do sudo apt-get remove $pkg; done
+
+        # Add Docker's official GPG key:
+        sudo apt-get update
+        sudo apt-get install ca-certificates curl
+        sudo install -m 0755 -d /etc/apt/keyrings
+        sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
+        sudo chmod a+r /etc/apt/keyrings/docker.asc
+
+        # Add the repository to Apt sources:
+        echo \
+          "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
+          $(. /etc/os-release && echo "${UBUNTU_CODENAME:-$VERSION_CODENAME}") stable" | \
+          sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
+        sudo apt-get update
+        sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
         docker version
 
         docker run --rm hello-world