Add --dryrun to allow testing to the docs-release site, and then fix the double dollar mistake

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)
Merge pull request #8722 from SvenDowideit/sven-cannot-bash

Add --dryrun to allow testing to the docs-release site, and then fix the...