updates: only send email notifications when not auto-updating

fixes #749

src/mail_templates/app_updates_available.ejs

@@ -3,9 +3,9 @@
 Dear Cloudron Admin,
 
 <% for (var i = 0; i < apps.length; i++) { -%>
-A new version <%= apps[i].updateInfo.manifest.version %> of the app '<%= apps[i].app.manifest.title %>' installed at <%= apps[i].app.fqdn %> is available.
+The app '<%= apps[i].app.manifest.title %>' installed at <%= apps[i].app.fqdn %> has an update available.
 
-Changes:
+<%= apps[i].app.manifest.title %> v<%= apps[i].updateInfo.manifest.version %> changes:
 <%= apps[i].updateInfo.manifest.changelog %>
 
 <% } -%>
@@ -29,10 +29,10 @@ Sent at: <%= new Date().toUTCString() %>
     <div style="width: 650px; text-align: left;">
 <% for (var i = 0; i < apps.length; i++) { -%>
         <p>
-            A new version <%= apps[i].updateInfo.manifest.version %> of the app '<%= apps[i].app.manifest.title %>' installed at <a href="https://<%= apps[i].app.fqdn %>"><%= apps[i].app.fqdn %></a> is available.
+            The app '<%= apps[i].app.manifest.title %>' installed at <a href="https://<%= apps[i].app.fqdn %>"><%= apps[i].app.fqdn %></a> has an update available.
         </p>
 
-        <h5>Changelog:</h5>
+        <h5><%= apps[i].app.manifest.title %> v<%= apps[i].updateInfo.manifest.version %> changes:</h5>
         <%- apps[i].changelogHTML %>
 
         <br/>

src/mail_templates/box_update_available.ejs

@@ -0,0 +1,45 @@
+<%if (format === 'text') { %>
+
+Dear <%= cloudronName %> Admin,
+
+Cloudron v<%= newBoxVersion %> is now available!
+
+Changes:
+<% for (var i = 0; i < changelog.length; i++) { %>
+  * <%- changelog[i] %>
+<% } %>
+
+Powered by https://cloudron.io
+
+Sent at: <%= new Date().toUTCString() %>
+
+<% } else { %>
+
+<center>
+
+<img src="<%= cloudronAvatarUrl %>" width="128px" height="128px"/>
+
+<h3>Dear <%= cloudronName %> Admin,</h3>
+
+<div style="width: 650px; text-align: left;">
+    <p>
+        Cloudron v<b><%= newBoxVersion %></b> is now available!
+    </p>
+
+    <h5>Changes:</h5>
+    <ul>
+    <% for (var i = 0; i < changelogHTML.length; i++) { %>
+        <li><%- changelogHTML[i] %></li>
+    <% } %>
+    </ul>
+
+    <br/>
+</div>
+
+<div style="font-size: 10px; color: #333333; background: #ffffff;">
+    Powered by <a href="https://cloudron.io">Cloudron</a>.
+</div>
+
+</center>
+
+<% } %>