Add support for pulling Spin OCI images #387

Job	Run time
rustfmt	24m 21s
build / build (ubuntu-latest, x86_64, slight, v1)	39m 5s
build-wasm-images / build_and_push (examples/spin-rust-hello, images/spin)	1m 24s
build / build (ubuntu-latest, x86_64, spin, v2)	39m 55s
build-wasm-images / build_and_push (examples/spin-dotnet-hello, images/spin_dotnet)	52s
build / build (ubuntu-latest, x86_64, wws, v1)	23m 52s
build-wasm-images / build_and_push (examples/slight-rust-hello, images/slight)	3m 57s
build / build (ubuntu-latest, x86_64, lunatic, v1)	21m 24s
build-wasm-images / build_and_push (examples/wws-js-hello, images/wws)	15s
build / build (ubuntu-latest, aarch64, slight, v1)	19m 15s
build-wasm-images / build_and_push (examples/spin-inbound-redis, images/spin-inbound-redis)	1m 16s
build / build (ubuntu-latest, aarch64, spin, v2)	19m 37s
build-wasm-images / build_and_push (examples/spin-outbound-redis, images/spin-outbound-redis)	56s
build / build (ubuntu-latest, aarch64, wws, v1)	24m 48s
build / build (ubuntu-latest, aarch64, lunatic, v1)	12m 31s
build-wasm-images / build_and_push (examples/lunatic-rust-hello, images/lunatic)	38s
build-wasm-images / build_and_push (examples/lunatic-spawn, images/lunatic-spawn)	3m 58s
build-wasm-images / build_and_push (examples/lunatic-submillisecond, images/lunatic-submillisecond)	4m 4s
test	11m 32s
	4h 13m 40s

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