Add docker language to syntax highlight

Use case is for it to be used on gerrit-review as we
Use it for ci image.

Change-Id: If612da9509353a5b043b5763cf67a0616439b2b5
diff --git a/gr-editor/gr-editor.html b/gr-editor/gr-editor.html
index 930312b..9e0fb46 100644
--- a/gr-editor/gr-editor.html
+++ b/gr-editor/gr-editor.html
@@ -22,6 +22,7 @@
 <script src="../bower_components/codemirror-minified/mode/clojure/clojure.js" ></script>
 <script src="../bower_components/codemirror-minified/mode/css/css.js" ></script>
 <script src="../bower_components/codemirror-minified/mode/dart/dart.js" ></script>
+<script src="../bower_components/codemirror-minified/mode/dockerfile/dockerfile.js" ></script>
 <script src="../bower_components/codemirror-minified/mode/erlang/erlang.js" ></script>
 <script src="../bower_components/codemirror-minified/mode/go/go.js" ></script>
 <script src="../bower_components/codemirror-minified/mode/haskell/haskell.js" ></script>