Support tar files for multi-arch images #977

Job	Run time
matrix-prep-bazelversion	5s
matrix-prep-os	9s
test-auth	2m 49s
test (ubuntu-latest, 6.2.0, ., true)	6m 14s
test (ubuntu-latest, 6.2.0, ., false)	5m 24s
test (ubuntu-latest, 6.2.0, e2e/custom_registry, false)	2m 34s
test (ubuntu-latest, 6.2.0, e2e/wasm, false)	1m 3s
test (ubuntu-latest, 6.2.0, e2e/smoke, true)	49s
test (ubuntu-latest, 6.2.0, e2e/smoke, false)	1m 9s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, true)	56s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, false)	40s
test (ubuntu-latest, 5.3.2, ., false)	5m 15s
test (ubuntu-latest, 5.3.2, e2e/custom_registry, false)	2m 1s
test (ubuntu-latest, 5.3.2, e2e/wasm, false)	1m 10s
test (ubuntu-latest, 5.3.2, e2e/smoke, false)	50s
test (ubuntu-latest, 5.3.2, e2e/crane_as_registry, false)	47s
	31m 55s

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