Run Django tests in docker environment from emacs using .dir-locals.el

<a href="http:&#x2F;&#x2F;archive.is&#x2F;QL2rh" rel="nofollow">http:&#x2F;&#x2F;archive.is&#x2F;QL2rh</a> in case my home server can’t handle it, or you’re browser doesn’t support js.