docs: add readme for debian versioning (#17610)

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>
renovatebot · Sep 4, 2022 · 89b8ebc · 89b8ebc
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+Debian versioning is used for Debian container images that are referenced by its major release version or a codename.
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+Versions to which this scheme applies are e.g. `11` and `bullseye`.
+Container image tags such as `11-slim`, `11.4` or `11.4-slim`, `bullseye-20220822` or `bullseye-backports` are not compliant with the current implementation.