feat(runway-base): Add a writeable /tmp dir.

Florian Forsterrequested to merge
fforster/tmp-dir into main

feat(runway-base): Add a writeable /tmp dir.

AI Gateway currently fails to start up with the following error:

$ kubectl logs app-staging-bf8695cf5-2vqdv -n ai-gateway-eks
Error in tempfile() using template /tmp/parXXXXX.tst: Could not create temp file /tmp/parXZi0z.tst: Read-only file system at /usr/bin/parallel line 6309.

Fixes: team#631 (closed)

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