fix: support external oci_image targets #1520

Job	Run time
matrix-prep-bazelversion	17s
matrix-prep-os	1s
test (ubuntu-latest, 7.1.1, ., true)	5m 37s
test (ubuntu-latest, 7.1.1, ., false)	2m 39s
test (ubuntu-latest, 7.1.1, e2e/wasm, false)	4m 23s
test (ubuntu-latest, 7.1.1, e2e/smoke, true)	38s
test (ubuntu-latest, 7.1.1, e2e/smoke, false)	2m 45s
test (ubuntu-latest, 7.1.1, e2e/assertion, true)	5m 36s
test (ubuntu-latest, 6.4.0, ., true)	2m 53s
test (ubuntu-latest, 6.4.0, ., false)	5m 48s
test (ubuntu-latest, 6.4.0, e2e/wasm, false)	2m 51s
test (ubuntu-latest, 6.4.0, e2e/smoke, true)	2m 26s
test (ubuntu-latest, 6.4.0, e2e/smoke, false)	19s
test (ubuntu-latest, 6.4.0, e2e/assertion, true)	6m 40s
test (macos-13, 7.1.1, ., true)	10m 1s
test (macos-13, 7.1.1, ., false)	4m 32s
test (macos-13, 7.1.1, e2e/smoke, true)	7m 47s
test (macos-13, 7.1.1, e2e/smoke, false)	2m 28s
	1h 7m 41s

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