Checking new gh actions runners

Author: gbayarri

.github/workflows/test_containers.yml

@@ -21,7 +21,7 @@ jobs:
   test_containers:
     strategy:
       matrix:
-        os: [ubuntu-latest]
+        os: [mmbswarm]
         python-version: ["3.11"]
     runs-on: ${{ matrix.os }}
     steps: