Merge pull request #25941 from imnuh/patch-1

Change TMPDIR to DOCKER_TMPDIR

contrib/init/sysvinit-debian/docker.default

@@ -17,4 +17,4 @@
 #export http_proxy="http://127.0.0.1:3128/"
 
 # This is also a handy place to tweak where Docker's temporary files go.
-#export TMPDIR="/mnt/bigdrive/docker-tmp"
+#export DOCKER_TMPDIR="/mnt/bigdrive/docker-tmp"