Murder docker container and network before run

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

.github/workflows/test-integration-v2-kradalby.yml

@@ -22,6 +22,14 @@ jobs:
             integration_test/
             config-example.yaml
 
+      # We currently only run one job at the time, so make sure
+      # we just wipe all containers and all networks.
+      - name: Clean up Docker
+        if: steps.changed-files.outputs.any_changed == 'true'
+        run: |
+          docker kill $(docker ps -q)
+          docker network prune -f
+
       - name: Run general integration tests
         if: steps.changed-files.outputs.any_changed == 'true'
         run: nix develop --command -- make test_integration_v2_general