Force setup-file download scheme to HTTPS

Up until now HTTPS was only offered by redirect, making MitM possible
before server redirect hit the client.
Add scheme-force to HTTPS to the url-generation.

fixes #963

setup/flavors/compose/setup.html

@@ -11,8 +11,8 @@ in a project directory. First create your project directory.</p>
 to read and check the configuration variables generated by the wizard.</p>
 
 <pre><code>cd {{ root }}
-wget {{ url_for('.file', uid=uid, filepath='docker-compose.yml', _external=True) }}
-wget {{ url_for('.file', uid=uid, filepath='mailu.env', _external=True) }}
+wget {{ url_for('.file', uid=uid, _scheme='https', filepath='docker-compose.yml', _external=True) }}
+wget {{ url_for('.file', uid=uid, _scheme='https', filepath='mailu.env', _external=True) }}
 </pre></code>
 {% endcall %}
 

setup/flavors/stack/setup.html

@@ -11,8 +11,8 @@ in a project directory. First create your project directory.</p>
 to read and check the configuration variables generated by the wizard.</p>
 
 <pre><code>cd {{ root }}
-wget {{ url_for('.file', uid=uid, filepath='docker-compose.yml', _external=True) }}
-wget {{ url_for('.file', uid=uid, filepath='mailu.env', _external=True) }}
+wget {{ url_for('.file', uid=uid, _scheme='https', filepath='docker-compose.yml', _external=True) }}
+wget {{ url_for('.file', uid=uid, _scheme='https', filepath='mailu.env', _external=True) }}
 </pre></code>
 {% endcall %}