Cleanup after running acceptance tests

While we try to cleanup after ourselves, it doesn't always work.
This will save us from having to RDP into the LCOW worker every so often

Signed-off-by: Natalie Arellano <narellano@vmware.com>

.github/workflows/compatibility.yml

@@ -59,3 +59,4 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           make acceptance
+          docker network prune