Record decision on min-max version support for OpenShift
The following discussion from !796 (closed) should be addressed:
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@clemensbeck started a discussion: (+2 comments) @dmakovey Per https://gitlab.com/gitlab-org/cloud-native/gitlab-operator/-/blob/master/doc/installation.md?ref_type=heads#cluster we still support 4.13. Why do we want to remove the CI testing?
From past conversations we've agreed to use min-max combination of versions in CI to cover entire spread of versions to minimize maintenance burden, however we've never documented it. We need to record this as ADR.