podman-registry helper script: handle errors

My initial revision of the podman-registry helper script
was written in haste, with an enormous tradeoff: no
visibility into any errors. We are now paying for this
in #6366: the script is failing on Ubuntu and we
have no way of knowing why.

This PR adds a must_pass() function used for critical
steps. This runs the action silently; if the command
fails, it displays the failing command name with
full output logs, cleans up the temporary workdir,
and exits with error status.

As a reminder, the reason this is necessary is that
our script convention is to output a series of
environment variables to stdout -- we must therefore
take pains not to emit anything else to stdout.
And, unfortunately, podman and openssl tend to be
rather verbose.

Signed-off-by: Ed Santiago <santiago@redhat.com>

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