container role docs : clarify requirements
skopeo is used from the executor in the promote process, but isn't required to be installed on nodes with ensure-skopeo. Clarify this and the runtime requirements. Change-Id: Ifaf4b788117986037b124972441b1884744374e5
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@ -34,9 +34,10 @@ They all accept the same input data, principally a list of
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dictionaries representing the images to build. YAML anchors_ can be
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used to supply the same data to all three jobs.
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Use the :zuul:role:`ensure-skopeo` role as well as the
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:zuul:role:`ensure-docker`, or :zuul:role:`ensure-podman` roles before
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using the roles described here.
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The build and upload roles require a container runtime that should be
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installed before use; for example by using either the
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:zuul:role:`ensure-docker` or :zuul:role:`ensure-podman` roles. The
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promote job assumes `skopeo` is available on the executor.
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**Role Variables**
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