For any given job there is a high likelihood that ccache will be able to
reuse previously built object files. This will result in faster build
pipelines in later updates.
Reviewed-by: NErik Skultety <eskultet@redhat.com>
Reviewed-by: NAndrea Bolognani <abologna@redhat.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>