RF: Drop trailing slashes from recipe URLs, as they get turned into e.g.

https://git.fmrib%2Ffsl%2Fconda%2f<recipename>%2F,  and gitlab returns a
404

fsl_ci/conda.py

@@ -73,6 +73,7 @@ def get_recipe_urls(project_name, server) -> Dict[str, str]:
     recipes = []
 
     for url in urls:
+        url  = url.rstrip('/')
         path = urlparse.urlparse(url).path.replace('.git', '')[1:]
         name = path.rsplit('/', 1)[-1]
         recipes.append({'url' : url, 'name' : name, 'path' : path})