fix: support external oci_image targets #1519

Job	Run time
matrix-prep-bazelversion	3s
matrix-prep-os	1s
test (ubuntu-latest, 7.1.1, ., true)	54s
test (ubuntu-latest, 7.1.1, ., false)	33s
test (ubuntu-latest, 7.1.1, e2e/wasm, false)	40s
test (ubuntu-latest, 7.1.1, e2e/smoke, true)	11s
test (ubuntu-latest, 7.1.1, e2e/smoke, false)	20s
test (ubuntu-latest, 7.1.1, e2e/assertion, true)	2m 51s
test (ubuntu-latest, 6.4.0, ., true)	1m 3s
test (ubuntu-latest, 6.4.0, ., false)	54s
test (ubuntu-latest, 6.4.0, e2e/wasm, false)	14s
test (ubuntu-latest, 6.4.0, e2e/smoke, true)	15s
test (ubuntu-latest, 6.4.0, e2e/smoke, false)	9s
test (ubuntu-latest, 6.4.0, e2e/assertion, true)	2m 35s
test (macos-13, 7.1.1, ., true)	2m 7s
test (macos-13, 7.1.1, ., false)	2m 36s
test (macos-13, 7.1.1, e2e/smoke, true)	2m 4s
test (macos-13, 7.1.1, e2e/smoke, false)	3m 23s
	20m 53s

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