feat(oci_pull): expose the digest as a file #1506

Job	Run time
matrix-prep-bazelversion	3s
matrix-prep-os	1s
test (ubuntu-latest, 6.4.0, ., true)	2m 58s
test (ubuntu-latest, 6.4.0, ., false)	3m 33s
test (ubuntu-latest, 6.4.0, e2e/custom_registry, false)	51s
test (ubuntu-latest, 6.4.0, e2e/wasm, false)	37s
test (ubuntu-latest, 6.4.0, e2e/smoke, true)	16s
test (ubuntu-latest, 6.4.0, e2e/smoke, false)	15s
test (ubuntu-latest, 6.4.0, e2e/crane_as_registry, true)	12s
test (ubuntu-latest, 6.4.0, e2e/crane_as_registry, false)	12s
test (ubuntu-latest, 6.4.0, e2e/pull, true)	1m 44s
test (ubuntu-latest, 6.4.0, ., true)	3m 10s
test (ubuntu-latest, 6.4.0, ., false)	2m 54s
test (ubuntu-latest, 6.4.0, e2e/custom_registry, false)	46s
test (ubuntu-latest, 6.4.0, e2e/wasm, false)	34s
test (ubuntu-latest, 6.4.0, e2e/smoke, true)	19s
test (ubuntu-latest, 6.4.0, e2e/smoke, false)	17s
test (ubuntu-latest, 6.4.0, e2e/crane_as_registry, true)	13s
test (ubuntu-latest, 6.4.0, e2e/crane_as_registry, false)	15s
test (ubuntu-latest, 6.4.0, e2e/pull, true)	2m 9s
	21m 19s

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