This is referenced by 9645cee4f2/lib/src/globals.rs (L16) specifically used for the (container image) pull secret in `/run/ostree/auth.json`. Let's pre-create the directory so users don't have to. Motivated by https://github.com/openshift/machine-config-operator/pull/3007#discussion_r824172564
9645cee4f2/lib/src/globals.rs (L16)