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Previously, the script would bind mount the user's home directory into the container in order to execute gcloud commands. This was done to preserve the `.config/gcloud` directory and new ssh keys in `.ssh`. However, it's possible the user has modified `.bash*` or `.ssh/config` files which do not play nicely with gcloud and/or the container. Fix this by mounting the existing temporary directory on the host, as the user's home directory. Then bind mount in a dedicated `gcloud/ssh` sub-directory, and the libpod repo directory on top. Pre-create the necessary mount-points as the user, so later removal does not require root on the host. The gcloud tool takes minutes to setup/manage its ssh-keys, so preserving that work between runs is a necessary optimization. Similarly, saving the `.gcloud` directory prevents repeatedly going through the lengthy client-auth process. Overall, these changes make the container environment much more selective with the host-side data it has access to use/modify. Preventing unrelated details from getting in the way, and preserving only the bare-minimum of details on the host, between runs. Signed-off-by: Chris Evich <cevich@redhat.com>