[lxd-import] github: put docker removal its own step

Signed-off-by: Simon Deziel <simon.deziel@canonical.com>
(cherry picked from commit 117e76b35d1f2f560299e6836797cf1fa3d395b5)

.github/workflows/tests.yml

@@ -190,6 +190,13 @@ jobs:
           sudo rm -rf /opt/ghc
           df -h /
 
+      - name: Remove docker
+        run: |
+          set -eux
+          sudo apt-get autopurge -y moby-containerd docker uidmap
+          sudo ip link delete docker0
+          sudo nft flush ruleset
+
       - name: Checkout
         uses: actions/checkout@v4
 
@@ -220,10 +227,6 @@ jobs:
           sudo add-apt-repository ppa:cowsql/stable -y --no-update
           sudo apt-get update
 
-          sudo apt-get autopurge moby-containerd docker uidmap -y
-          sudo ip link delete docker0
-          sudo nft flush ruleset
-
           sudo systemctl mask lxc.service
           sudo systemctl mask lxc-net.service