login: set expectations for dev version

data/resources/style.css

@@ -23,6 +23,12 @@
   min-width: 250px;
 }
 
+#devnotice {
+  background-color: @warning_color;
+  padding: 6px;
+  border-radius: 10px;
+}
+
 /* Session */
 .session-loading-spinner {
   min-width: 32px;

data/resources/ui/login.ui

@@ -60,6 +60,25 @@
                                 <property name="visible">False</property>
                               </object>
                             </child>
+                            <child>
+                              <object class="GtkBox">
+                                <property name="name">devnotice</property>
+                                <child>
+                                  <object class="GtkImage" id="development_icon">
+                                    <property name="icon-name">dialog-warning-symbolic</property>
+                                  </object>
+                                </child>
+                                <child>
+                                  <object class="GtkLabel" id="development_notice">
+                                    <property name="label" translatable="yes">You are running an early stage development version. Be aware it is a work in progress and far from complete yet.</property>
+                                    <property name="wrap">True</property>
+                                    <style>
+                                      <class name="warning"/>
+                                    </style>
+                                  </object>
+                                </child>
+                              </object>
+                            </child>
                             <child>
                               <object class="GtkListBox">
                                 <child>