recipe: add sft/docker core images; +alma8, -centos8/9
New "core" layers that only contain hep_oslibs, and no sft build specific configuration otherwise.
remove centos8 and centos9, add alma8
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New "core" layers that only contain hep_oslibs, and no sft build specific configuration otherwise.
remove centos8 and centos9, add alma8