Support tar files for multi-arch images #993

Job	Run time
test-auth	2m 11s
matrix-prep-bazelversion	4s
matrix-prep-os	1s
test (ubuntu-latest, 6.2.0, ., true)	7m 27s
test (ubuntu-latest, 6.2.0, ., false)	5m 45s
test (ubuntu-latest, 6.2.0, e2e/custom_registry, false)	1m 18s
test (ubuntu-latest, 6.2.0, e2e/wasm, false)	1m 5s
test (ubuntu-latest, 6.2.0, e2e/smoke, true)	28s
test (ubuntu-latest, 6.2.0, e2e/smoke, false)	22s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, true)	38s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, false)	19s
test (ubuntu-latest, 5.3.2, ., false)	7m 1s
test (ubuntu-latest, 5.3.2, e2e/custom_registry, false)	53s
test (ubuntu-latest, 5.3.2, e2e/wasm, false)	1m 26s
test (ubuntu-latest, 5.3.2, e2e/smoke, false)	35s
test (ubuntu-latest, 5.3.2, e2e/crane_as_registry, false)	34s
	30m 7s

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