make tmp dir writable

.ebextensions/tmp_dir.config

+files:
+  "/opt/elasticbeanstalk/hooks/appdeploy/pre/00_set_tmp_permissions.sh":
+    mode: "000755"
+    owner: root
+    group: root
+    content: |
+      #!/usr/bin/env bash
+      chmod -R 777 /tmp