add envsetup for ubicast web configuration interface, refs #21550

1.Base/4.configuration_webinterface/0_setup.py

+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+import utils
+
+
+def setup(interactive=True):
+    # Create / update admin account
+    utils.log('Checking admin account')
+    cmds = list()
+    cmds.append('apt-get install python3-ubicast-webconf')
+    # Set password if any
+    settings = {
+        "password": utils.get_conf('WEBCONF_PWD', 'changeme'),
+        "port": utils.get_conf('WEBCONF_PORT', '9999'),
+    }
+    with open('webconf.json.template', 'r') as f:
+        d = f.read()
+    with open('/etc/webconf.json', 'w') as f:
+        f.write(d.format(**settings))

1.Base/4.configuration_webinterface/webconf.json.template

+{
+    "listen_ip": "0.0.0.0",
+    "password": "{password}",
+    "port": {port}
+}