feat(self-hosting): sign and attest published images, and correct the self-hosting docs #30143

Job	Run time
Test and Build / Lint and Test	2m 33s
Test and Build / Test (shard 2)	1m 44s
Test and Build / Test (shard 3)	2m 17s
Test and Build / Build App	3m 23s
Detect Desktop Changes	0s
Build AMD64	0s
Check Docs Changes	0s
Detect Version	0s
Deploy Trigger.dev (Dev)	0s
Check Desktop Signing Secrets	0s
Build Dev ECR	0s
Create Desktop Prerelease	-1s
Desktop Prerelease Build	-1s
Prune Desktop Prereleases	0s
Publish Desktop Prerelease	-1s
Migrate Dev DB	-7s
Build ARM64 (GHCR Only)	-8s
Migrate DB	-1s
Promote Images	0s
Process Docs	0s
Create GHCR Manifests	0s
Resolve Attestation Subjects	0s
Create GitHub Release	0s
Attest Images	0s
Desktop Release	-1s
	9m 37s

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