Hooks for sentry integration (#1460)

* add sentry webpack plugin

* allow override of webpack config

* work around cheerio inability to parse jinga templates

* webpack can not minify jinja templates

* allow script injection to specify other attributes

* allow script injection to specify other attributes

* Adjustments to make plugin systems work

* Add sourcemaps for javascript in prod webpack

* Update .gitignore

* Fix spelling errors

Co-authored-by: Matt Weiden <538456+mweiden@users.noreply.github.com>

client/index_template.html

@@ -50,12 +50,15 @@
     </noscript>
 
     <div id="root"></div>
-    {% for script in SCRIPTS %}
-    <script type="text/javascript" src="{{script | safe}}"></script>
-    {% endfor %}
+    {% for script in SCRIPTS -%}
+    <script type="text/javascript"
+      {{ ('integrity="%s"' % script.integrity) | safe if script.integrity }}
+      {{ ('crossorigin="%s"' % script.crossorigin) | safe if script.crossorigin }}
+      src="{{script.src | safe}}"
+    ></script>
+    {%- endfor %}
 
     {% for ils in INLINE_SCRIPTS %}
-    <!-- caution: do not change white space in this script element -->
     <script type="text/javascript" no-csp-hash>{% include ils %}</script>
     {% endfor %}
   </body>