refactor: make crane write blobs to disk (#414) #1007

Job	Run time
matrix-prep-os	1s
matrix-prep-bazelversion	3s
test-auth	2m 0s
test (ubuntu-latest, 6.2.0, ., true)	2m 25s
test (ubuntu-latest, 6.2.0, ., false)	2m 23s
test (ubuntu-latest, 6.2.0, e2e/custom_registry, false)	1m 5s
test (ubuntu-latest, 6.2.0, e2e/wasm, false)	59s
test (ubuntu-latest, 6.2.0, e2e/smoke, true)	17s
test (ubuntu-latest, 6.2.0, e2e/smoke, false)	24s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, true)	18s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, false)	14s
test (ubuntu-latest, 5.3.2, ., false)	4m 47s
test (ubuntu-latest, 5.3.2, e2e/custom_registry, false)	52s
test (ubuntu-latest, 5.3.2, e2e/wasm, false)	38s
test (ubuntu-latest, 5.3.2, e2e/smoke, false)	22s
test (ubuntu-latest, 5.3.2, e2e/crane_as_registry, false)	19s
test (macos-latest, 6.2.0, ., true)	9m 53s
test (macos-latest, 6.2.0, ., false)	9m 15s
test (macos-latest, 6.2.0, e2e/smoke, true)	58s
test (macos-latest, 6.2.0, e2e/smoke, false)	54s
	38m 7s

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