Remove container after failure with --force-rm

Docker-DCO-1.1-Signed-off-by: Adrien Folie <folie.adrien@gmail.com> (github: folieadrien)
I think *all* copies of `.. after unsuccessful run.` should be replaced with `.. after an unsuccessful run.` - given the nounsely nature of the word "run" here.

@fredlf what do you reckon, any thoughts?