[CI:DOCS] Multi-arch image workflow: Make steps generic

This duplicates the change from
https://github.com/containers/skopeo/pull/1379

Since this workflow is duplicated across three repositories, maintaining
changes becomes onerous if the item contents vary between
implementations in any way. Improve this situation by encoding the
repository-specific details into env. vars. then referencing those vars
throughout. This way, a meaningful diff can be worked with to compare
the contents across repositories.

Also included are abstractions for the specific command used to obtain
the project version, and needed details for filtering the output. Both
of these vary across the Buildah, Skopeo, and Podman repos.

NOTE: This change requires the names of two github action secrets
to be updated: PODMAN_QUAY_USERNAME -> REPONAME_QUAY_USERNAME
(and *PASSWORD).

Signed-off-by: Chris Evich <cevich@redhat.com>

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