When on CI, enable RSpec profiling for `master` only
When on CI, enable RSpec profiling for `master` only

We don't actually need to monitor RSpec for all our branches.

Signed-off-by: Rémy Coutable <4ea0184b9df19e0786dd00b28e6daa4d26baeb3e@rymai.me>

t-zuehlsdorff/gitlabhq,stoplightio/gitlabhq,jirutka/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,jirutka/gitlabhq,htve/GitlabForChinese,mmkassem/gitlabhq,htve/GitlabForChinese,iiet/iiet-git,htve/GitlabForChinese,darkrasid/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,dplarson/gitlabhq,dplarson/gitlabhq,dreampet/gitlab,t-zuehlsdorff/gitlabhq,darkrasid/gitlabhq,darkrasid/gitlabhq,htve/GitlabForChinese,jirutka/gitlabhq,mmkassem/gitlabhq,axilleas/gitlabhq,jirutka/gitlabhq,iiet/iiet-git,darkrasid/gitlabhq,stoplightio/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,t-zuehlsdorff/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,dplarson/gitlabhq,dplarson/gitlabhq,axilleas/gitlabhq,t-zuehlsdorff/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,dreampet/gitlab