Remove the cache when deploying a new branch

managetests/branches.py

@@ -99,6 +99,7 @@ class Branch:
              "%s/%s/static" % (self.manager.envs_dir, self.name,
                 sys.version_info[1], self.manager.public_dir, self.name)),
             "rm -rf %s" % self.manager.build_dir,
+            "rm -rf %s/%s/*" % (self.caches_dir, self.name),
         ]
 
         for command in commands: