Install concierge with go until canonical/concierge#81 released

Author: carlcsaposs-canonical

spread.yaml

@@ -121,10 +121,12 @@ prepare: |
   snap refresh --hold
   chown -R root:root "$SPREAD_PATH"
   cd "$SPREAD_PATH"
-  snap install --classic concierge
+  # Unable to install concierge via snap on s390x:
+  # https://github.com/canonical/concierge/issues/76
+  go install github.com/canonical/concierge@latest
 
   # Install charmcraft & pipx on lxd-vm backend and install pipx on IS-hosted runners
-  concierge prepare --trace
+  ~/go/bin/concierge prepare --trace
 
   pipx install tox poetry
 prepare-each: |
@@ -136,7 +138,7 @@ prepare-each: |
     poetry add --lock --group integration juju@^2
   fi
   # `concierge prepare` needs to be run for each spread job in case Juju version changed
-  concierge prepare --trace
+  ~/go/bin/concierge prepare --trace
 
   # Unable to set constraint on all models because of Juju bug:
   # https://bugs.launchpad.net/juju/+bug/2065050