feat: provide the sha256 digest as an oci_image target #831

Job	Run time
test-auth	2m 36s
test-auth	2m 36s
matrix-prep-bazelversion	2s
matrix-prep-bazelversion	2s
test (ubuntu-latest, 6.2.0, ., true)	3m 42s
test (ubuntu-latest, 6.2.0, ., true)	3m 42s
test (ubuntu-latest, 6.2.0, ., false)	3m 31s
test (ubuntu-latest, 6.2.0, ., false)	3m 31s
test (ubuntu-latest, 6.2.0, e2e/custom_registry, false)	1m 0s
test (ubuntu-latest, 6.2.0, e2e/custom_registry, false)	1m 0s
test (ubuntu-latest, 6.2.0, e2e/wasm, false)	3m 20s
test (ubuntu-latest, 6.2.0, e2e/wasm, false)	3m 20s
test (ubuntu-latest, 6.2.0, e2e/smoke, true)	2m 28s
test (ubuntu-latest, 6.2.0, e2e/smoke, true)	2m 28s
test (ubuntu-latest, 6.2.0, e2e/smoke, false)	4m 6s
test (ubuntu-latest, 6.2.0, e2e/smoke, false)	4m 6s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, true)	3m 18s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, true)	3m 18s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, false)	1m 58s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, false)	1m 58s
test (ubuntu-latest, 5.3.2, ., false)	1m 21s
test (ubuntu-latest, 5.3.2, ., false)	1m 2s
test (ubuntu-latest, 5.3.2, e2e/custom_registry, false)	1m 22s
test (ubuntu-latest, 5.3.2, e2e/custom_registry, false)	1m 22s
test (ubuntu-latest, 5.3.2, e2e/wasm, false)	4m 48s
test (ubuntu-latest, 5.3.2, e2e/wasm, false)	4m 48s
test (ubuntu-latest, 5.3.2, e2e/smoke, false)	2m 32s
test (ubuntu-latest, 5.3.2, e2e/smoke, false)	2m 32s
test (ubuntu-latest, 5.3.2, e2e/crane_as_registry, false)	2m 37s
test (ubuntu-latest, 5.3.2, e2e/crane_as_registry, false)	2m 37s
	1h 17m 3s

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