docs: add readme for ubuntu versioning (#17612)

renovatebot · Sep 4, 2022 · 29da39a · 29da39a
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+Ubuntu versioning is used for Ubuntu container images that are referenced by their release version or a codename.
+
+Versions to which this scheme applies are e.g. `22.04` and `jammy`.
+Container image tags such as `jammy-20220815` or `focal-20220826` are not compliant with the current implementation.