feat: provide support for an overridable template to be included in every view (#12315)

superset/templates/superset/base.html

@@ -34,4 +34,5 @@
   {{ super() }}
   {{ js_bundle("preamble") }}
   {{ js_bundle('menu') }}
+  {% include "tail_js_custom_extra.html" %}
 {% endblock %}

superset/templates/superset/basic.html

@@ -103,6 +103,7 @@
       {% if entry %}
         {{ js_bundle(entry) }}
       {% endif %}
+      {% include "tail_js_custom_extra.html" %}
     {% endblock %}
   </body>
 </html>

superset/templates/superset/crud_views.html

@@ -23,4 +23,5 @@
 
 {% block tail_js %}
   {{ js_bundle("crudViews") }}
+  {% include "tail_js_custom_extra.html" %}
 {% endblock %}

superset/templates/tail_js_custom_extra.html

@@ -0,0 +1,25 @@
+{#
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements.  See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership.  The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing,
+  software distributed under the License is distributed on an
+  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  KIND, either express or implied.  See the License for the
+  specific language governing permissions and limitations
+  under the License.
+#}
+
+{#
+  This file may be overriden in your custom deployment.
+  It will be included in every view in superset and is a
+  good place to include your custom frontend code, such as
+  scripts to initialize google analytics, intercom, segment, etc.
+#}