docs(all): add section for `sackd` #32

Job	Run time
ci-tests / Inclusive naming check	4s
ci-tests / Lint	8s
ci-tests / Static type checking	29s
ci-tests / Unit tests	23s
ci-tests / Integration tests (LXD) \| [email protected]	25m 43s
Release to Charmhub (slurmctld)	14m 13s
Release to Charmhub (slurmd)	10m 42s
Release to Charmhub (slurmdbd)	6m 19s
Release to Charmhub (slurmrestd)	6m 19s
Release to Charmhub (sackd)	6m 21s
	1h 10m 41s

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