Fix CSP needlessly allowing blob URLs in script-src (#11620)

config/initializers/content_security_policy.rb

@@ -31,10 +31,12 @@ Rails.application.config.content_security_policy do |p|
     webpacker_urls = %w(ws http).map { |protocol| "#{protocol}#{Webpacker.dev_server.https? ? 's' : ''}://#{Webpacker.dev_server.host_with_port}" }
 
     p.connect_src :self, :data, :blob, assets_host, media_host, Rails.configuration.x.streaming_api_base_url, *webpacker_urls
-    p.script_src  :self, :blob, :unsafe_inline, :unsafe_eval, assets_host
+    p.script_src  :self, :unsafe_inline, :unsafe_eval, assets_host
+    p.worker_src  :self, :blob, assets_host
   else
     p.connect_src :self, :data, :blob, assets_host, media_host, Rails.configuration.x.streaming_api_base_url
-    p.script_src  :self, :blob, assets_host
+    p.script_src  :self, assets_host
+    p.worker_src  :self, :blob, assets_host
   end
 end