Add support for pulling Spin OCI images #389

Job	Run time
rustfmt	26m 42s
build / build (ubuntu-latest, x86_64, slight, v1)	18m 29s
build-wasm-images / build_and_push (examples/spin-rust-hello, images/spin)	1m 24s
build / build (ubuntu-latest, x86_64, spin, v2)	19m 24s
build-wasm-images / build_and_push (examples/spin-dotnet-hello, images/spin_dotnet)	1m 17s
build / build (ubuntu-latest, x86_64, wws, v1)	13m 59s
build-wasm-images / build_and_push (examples/slight-rust-hello, images/slight)	4m 9s
build / build (ubuntu-latest, x86_64, lunatic, v1)	11m 58s
build-wasm-images / build_and_push (examples/wws-js-hello, images/wws)	19s
build / build (ubuntu-latest, aarch64, slight, v1)	19m 26s
build-wasm-images / build_and_push (examples/spin-inbound-redis, images/spin-inbound-redis)	1m 26s
build / build (ubuntu-latest, aarch64, spin, v2)	19m 37s
build / build (ubuntu-latest, aarch64, wws, v1)	24m 29s
build-wasm-images / build_and_push (examples/spin-outbound-redis, images/spin-outbound-redis)	56s
build-wasm-images / build_and_push (examples/lunatic-rust-hello, images/lunatic)	31s
build / build (ubuntu-latest, aarch64, lunatic, v1)	24m 35s
build-wasm-images / build_and_push (examples/lunatic-spawn, images/lunatic-spawn)	4m 4s
build-wasm-images / build_and_push (examples/lunatic-submillisecond, images/lunatic-submillisecond)	4m 31s
test	18m 35s
	3h 35m 51s

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