try prepare fix

Author: carlcsaposs-canonical

spread.yaml

@@ -90,6 +90,13 @@ backends:
       UBUNTU_PRO_TOKEN: '$(HOST: echo $UBUNTU_PRO_TOKEN)'
       LANDSCAPE_ACCOUNT_NAME: '$(HOST: echo $LANDSCAPE_ACCOUNT_NAME)'
       LANDSCAPE_REGISTRATION_KEY: '$(HOST: echo $LANDSCAPE_REGISTRATION_KEY)'
+    # TODO add renovate comment for rust version
+    prepare: |
+      if [[ $SPREAD_SYSTEM == *"s390x"* ]]
+      then
+        rustup set profile minimal
+        rustup default 1.88.0
+      fi
     systems:
       - ubuntu-24.04:
           username: runner
@@ -105,11 +112,6 @@ backends:
             # (These packages are being built when installing poetry or integration test Python
             # dependencies)
             CONCIERGE_EXTRA_DEBS: pipx,rustup
-          # TODO add renovate comment for rust version
-          prepare: |
-            exit 1
-            rustup set profile minimal
-            rustup default 1.88.0
           variants:
             - -juju29_ubuntu22