TBR: Website: Switch /tmp for $TMPDIR

Change-Id: I662ad4b724b382583edd89f8068439a53da84639
diff --git a/content/syncbase/quickstart.md b/content/syncbase/quickstart.md
index a0d9919..2849c31 100644
--- a/content/syncbase/quickstart.md
+++ b/content/syncbase/quickstart.md
@@ -7,7 +7,7 @@
 {{# helpers.hidden }}
 <!-- @setupEnvironment @test -->
 ```
-SYNCBASE_ANDROID_PROJECT_DIR=$(mktemp -d /tmp/tmp.XXXXXXXXXX)
+SYNCBASE_ANDROID_PROJECT_DIR=$(mktemp -d "${TMPDIR:-/tmp}/tmp.XXXXXXXXXX")
 cp -r $JIRI_ROOT/website/tools/android_project_stubs/quickstart/* $SYNCBASE_ANDROID_PROJECT_DIR
 cd $SYNCBASE_ANDROID_PROJECT_DIR
 ```