Add Artifact Attestations (#926) #420

Job	Run time
NIF 2.15 - aarch64-apple-darwin (macos-11 \| default)	37m 24s
NIF 2.15 - aarch64-unknown-linux-gnu (ubuntu-20.04 \| default)	10m 47s
NIF 2.15 - aarch64-unknown-linux-musl (ubuntu-20.04 \| default)	10m 39s
NIF 2.15 - x86_64-apple-darwin (macos-11 \| default)	39m 14s
NIF 2.15 - x86_64-pc-windows-gnu (windows-2022 \| default)	21m 39s
NIF 2.15 - x86_64-pc-windows-gnu (windows-2022 \| legacy_cpu)	22m 26s
NIF 2.15 - x86_64-pc-windows-msvc (windows-2019 \| default)	20m 41s
NIF 2.15 - x86_64-pc-windows-msvc (windows-2019 \| legacy_cpu)	19m 48s
NIF 2.15 - x86_64-unknown-freebsd (ubuntu-22.04 \| default)	10m 22s
NIF 2.15 - x86_64-unknown-freebsd (ubuntu-22.04 \| legacy_cpu)	10m 40s
NIF 2.15 - x86_64-unknown-linux-gnu (ubuntu-20.04 \| default)	9m 38s
NIF 2.15 - x86_64-unknown-linux-gnu (ubuntu-20.04 \| legacy_cpu)	9m 18s
NIF 2.15 - x86_64-unknown-linux-musl (ubuntu-20.04 \| default)	10m 3s
	3h 52m 39s

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