set GIT_LFS_TEST_DIR for docker tests

Author: technoweenie

docker/test_lfs.bsh

@@ -7,10 +7,11 @@ git lfs init
 git config --global user.email "[email protected]"
 git config --global user.name "Your Name"
 
+mkdir /tmp/lfs-test-dir
 cp -ra /src /tmp/test/
 cd /tmp/test
 mkdir -p ./src/github.com/github
 unlink src/github.com/github/git-lfs || :
 ln -sf $(pwd) src/github.com/github/git-lfs
 LFS_BIN=1 GOPATH=$(pwd) ./script/test
-LFS_BIN=1 ./script/integration
+LFS_BIN=1 GIT_LFS_TEST_DIR=/tmp/lfs-test-dir ./script/integration