outposts: handle docker connection error on init

passbook/outposts/controllers/docker.py

@@ -24,7 +24,10 @@ class DockerController(BaseController):
 
     def __init__(self, outpost: Outpost) -> None:
         super().__init__(outpost)
-        self.client = from_env()
+        try:
+            self.client = from_env()
+        except DockerException as exc:
+            raise ControllerException from exc
 
     def _get_labels(self) -> Dict[str, str]:
         return {}

passbook/outposts/templates/outposts/deployment_modal.html

@@ -24,6 +24,7 @@
                         <label class="pf-c-form__label" for="help-text-simple-form-name">
                             <span class="pf-c-form__label-text">PASSBOOK_TOKEN</span>
                         </label>
+                        {# TODO: Only load key on modal open #}
                         <input class="pf-c-form-control" data-pb-fetch-key="key" data-pb-fetch-fill="{% url 'passbook_api:token-view-key' identifier=outpost.token_identifier %}" readonly type="text" value="" />
                     </div>
                     <h3>{% trans 'If your passbook Instance is using a self-signed certificate, set this value.' %}</h3>