Add docker language to syntax highlight
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

GerritCodeReview/plugins_codemirror-editor,GerritCodeReview/plugins_codemirror-editor,GerritCodeReview/plugins_codemirror-editor