install pipx

Author: carlcsaposs-canonical

spread.yaml

@@ -99,6 +99,8 @@ backends:
             - -juju29_ubuntu22
       - self-hosted-linux-s390x-noble-edge:
           username: ubuntu
+          environment:
+            CONCIERGE_EXTRA_DEBS: pipx
           variants:
             - -juju29_ubuntu22
 
@@ -120,7 +122,7 @@ prepare: |
   cd "$SPREAD_PATH"
   snap install --classic concierge
 
-  # Install charmcraft & pipx (on lxd-vm backend)
+  # Install charmcraft & pipx on lxd-vm backend and install pipx on IS-hosted runners
   concierge prepare --trace
 
   pipx install tox poetry