Run podman tests on 10 nodes (#6553)

* Run podman tests on 10 nodes

* Update .github/workflows/podman-test.yaml

Co-authored-by: Armel Soro <armel@rm3l.org>

---------

Co-authored-by: Armel Soro <armel@rm3l.org>

.github/workflows/podman-test.yaml

@@ -23,7 +23,11 @@ jobs:
 
     - name: Run Integration tests
       env:
-        PODMAN_EXEC_NODES: ${{ secrets.PODMAN_TEST_EXEC_NODES }}
+        # This should ideally be a configuration in the GH repo (secret or variable).
+        # This is currently hard-coded because GH won't expose secrets or variables to PRs created from forks.
+        # Hopefully, variables (which are non-sensible by definition) will be passed to workflows triggered by PRs from forks.
+        # See https://github.com/community/community/discussions/44322
+        PODMAN_EXEC_NODES: 10
       run: make test-integration-podman
 
     - name: List and stop remaining containers