doc/plans: Update OCI sealing spec (kernel sigs, flattened layers) #594

Job	Run time
fedora	10m 41s
Unprivileged smoke test	5m 3s
Fuzz smoke test	5m 59s
nightly	3m 16s
Example tests (uki/fedora)	11m 17s
Example tests (unified-secureboot/fedora)	7m 48s
Example tests (bls/fedora-compat)	7m 31s
Example tests (bls/arch)	6m 51s
Example tests (bls/rhel9)	8m 5s
Example tests (bls/fedora)	6m 8s
Example tests (bls/arch)	5m 44s
Example tests (unified/fedora)	8m 56s
C API compatibility	58s
Integration tests (centos-stream9)	22m 33s
Integration tests (centos-stream10)	24m 51s
required-checks	2s
	2h 15m 43s

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