feat: support oci_image_index in oci_tarball (#325) #994

Job	Run time
matrix-prep-os	2s
matrix-prep-bazelversion	5s
test-auth	3m 1s
test (ubuntu-latest, 6.2.0, ., true)	6m 8s
test (ubuntu-latest, 6.2.0, ., false)	8m 15s
test (ubuntu-latest, 6.2.0, e2e/custom_registry, false)	2m 12s
test (ubuntu-latest, 6.2.0, e2e/wasm, false)	1m 9s
test (ubuntu-latest, 6.2.0, e2e/smoke, true)	24s
test (ubuntu-latest, 6.2.0, e2e/smoke, false)	22s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, true)	53s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, false)	56s
test (ubuntu-latest, 5.3.2, ., false)	5m 53s
test (ubuntu-latest, 5.3.2, e2e/custom_registry, false)	1m 46s
test (ubuntu-latest, 5.3.2, e2e/wasm, false)	1m 16s
test (ubuntu-latest, 5.3.2, e2e/smoke, false)	31s
test (ubuntu-latest, 5.3.2, e2e/crane_as_registry, false)	51s
test (macos-latest, 6.2.0, ., true)	10m 9s
test (macos-latest, 6.2.0, ., false)	5m 12s
test (macos-latest, 6.2.0, e2e/smoke, true)	2m 10s
test (macos-latest, 6.2.0, e2e/smoke, false)	2m 7s
	53m 22s

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