Enhance stage aliases to "move" remote stages to the same host, so that drush has to use SSH

templates/drush-9.stages.site.yml.jinja2

@@ -10,6 +10,9 @@
 {{ instance.src.git.branch }}:
   root: {{ instanceWebRoot }}{{ instance.root|default("") }}/
   uri: {{ domain.protocol|default("https") }}://{{ domain.domain }}
+{% if instance.src.git.branch != drupal.src.git.branch %}
+  host: {{ inventory_hostname }}
+{% endif %}
 {% endfor %}
 {% endif %}
 {% endfor %}