Dimitrios Liappis 91b5669d99 [docs] Add missing RUN command from custom docker config
Fix the `Dockerfile` example in the `Customizing image` third configuration
method by adding the missing RUN instruction.

Originally reported by Shankar Vasudevan (@vshank77).

Relates #21973
2017-01-11 11:13:05 +02:00
..