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Teach `pkd` a new flag `-L, --temp-dir=<mkdtemp-template>` to enable behavior whereby `pkd` creates a new temporary directory and uses it for a workspace while running. The original design of `pkd` assumed that it could freely use the current working directory from wherever it happened to be invoked. But, this could pose a problem when multiple `pkd` instances are run in parallel from the same working directory, due to the usage of various temporary files within that directory. To avoid the problem of multiple `pkd` instances interfering with each other, expose a `-L` flag for optionally specifying a `mkdtemp` template string such that a temporary scratch space is used instead. Testing notes: - I ran handfuls of iterations locally using the new flag and observed `pkd` is indeed using scratch space as desired. Resolves https://gitlab.com/libssh/libssh-mirror/-/issues/143. Signed-off-by: Jon Simons <jon@jonsimons.org> Reviewed-by: Jakub Jelen <jjelen@redhat.com>