Update on "Add macos unittest"

This is a port of pytorch/vision#2727




[ghstack-poisoned]

Author: pbelevich

.circleci/unittest/linux/scripts/setup_env.sh

@@ -22,7 +22,7 @@ esac
 # 1. Install conda at ./conda
 if [ ! -d "${conda_dir}" ]; then
     printf "* Installing conda\n"
-    wget -O miniconda.sh http://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh
+    wget -O miniconda.sh "http://repo.continuum.io/miniconda/Miniconda3-latest-${os}-x86_64.sh"
     bash ./miniconda.sh -b -f -p "${conda_dir}"
 fi
 eval "$(${conda_dir}/bin/conda shell.bash hook)"