oci_tarball: fix file time to 2000-01-01 for files inside the tar (#380) #909

Job	Run time
test-auth	2m 42s
matrix-prep-bazelversion	3s
test (ubuntu-latest, 6.2.0, ., true)	2m 55s
test (ubuntu-latest, 6.2.0, ., false)	1m 36s
test (ubuntu-latest, 6.2.0, e2e/custom_registry, false)	30s
test (ubuntu-latest, 6.2.0, e2e/wasm, false)	35s
test (ubuntu-latest, 6.2.0, e2e/smoke, true)	20s
test (ubuntu-latest, 6.2.0, e2e/smoke, false)	13s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, true)	20s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, false)	21s
test (ubuntu-latest, 5.3.2, ., false)	3m 21s
test (ubuntu-latest, 5.3.2, e2e/custom_registry, false)	35s
test (ubuntu-latest, 5.3.2, e2e/wasm, false)	1m 3s
test (ubuntu-latest, 5.3.2, e2e/smoke, false)	27s
test (ubuntu-latest, 5.3.2, e2e/crane_as_registry, false)	20s
	15m 21s

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