docs: Add SPEC.md #47

Job	Run time
Build release artifacts (macos-15-intel, x86_64-darwin)	5m 12s
Build release artifacts (macos-latest, arm64-darwin)	8m 32s
Build release artifacts (ubuntu-22.04, x86_64-linux)	3m 6s
Build release artifacts (ubuntu-22.04-arm, arm64-linux)	2m 34s
Build Docker image for ${{ matrix.platform }}	0s
Create and push multi-arch manifest	0s
build:required	3s
Create release	-1s
	19m 26s

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