Restore CI test to run debian container instead of just pulling image

Author: tizpuppi

.github/workflows/ci.yml

@@ -37,9 +37,9 @@ jobs:
           mkdir -p ~/.ssh
           ssh-keyscan -t rsa -p 2222 127.0.0.1 >> ~/.ssh/known_hosts
 
-      - name: Pull an image to verify that docker system prune will work
+      - name: Run a container to verify that docker system prune will work
         run: |
-          ssh -p 2222 [email protected] docker pull debian:12
+          ssh -p 2222 [email protected] docker run --name debian debian:12
         shell: bash
 
       - name: Test
@@ -67,6 +67,14 @@ jobs:
           fi
         shell: bash
 
+      - name: Check that the Debian container got removed
+        run: |
+          if ssh -p 2222 [email protected] docker container inspect debian; then
+              echo "Debian container was not cleaned up!"
+              exit 1
+          fi
+        shell: bash
+
       - name: Check that the Debian image got removed
         run: |
           if ssh -p 2222 [email protected] docker image inspect debian:12; then