docs: oci_push authorization #873

Job	Run time
matrix-prep-bazelversion	6s
test-auth	2m 30s
test (ubuntu-latest, 6.2.0, ., true)	4m 9s
test (ubuntu-latest, 6.2.0, ., false)	5m 30s
test (ubuntu-latest, 6.2.0, e2e/custom_registry, false)	4m 20s
test (ubuntu-latest, 6.2.0, e2e/wasm, false)	3m 30s
test (ubuntu-latest, 6.2.0, e2e/smoke, true)	1m 42s
test (ubuntu-latest, 6.2.0, e2e/smoke, false)	2m 17s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, true)	1m 12s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, false)	2m 11s
test (ubuntu-latest, 5.3.2, ., false)	5m 22s
test (ubuntu-latest, 5.3.2, e2e/custom_registry, false)	3m 40s
test (ubuntu-latest, 5.3.2, e2e/wasm, false)	4m 28s
test (ubuntu-latest, 5.3.2, e2e/smoke, false)	2m 19s
test (ubuntu-latest, 5.3.2, e2e/crane_as_registry, false)	3m 10s
	46m 26s

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