add docker.elastic.co registry support #1100

Job	Run time
matrix-prep-os	1s
matrix-prep-bazelversion	2s
test (ubuntu-latest, 6.2.0, ., true)	3m 30s
test (ubuntu-latest, 6.2.0, ., false)	5m 45s
test (ubuntu-latest, 6.2.0, e2e/custom_registry, false)	1m 41s
test (ubuntu-latest, 6.2.0, e2e/wasm, false)	56s
test (ubuntu-latest, 6.2.0, e2e/smoke, true)	1m 0s
test (ubuntu-latest, 6.2.0, e2e/smoke, false)	57s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, true)	38s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, false)	54s
test (ubuntu-latest, 6.2.0, e2e/pull, true)	1m 58s
test (ubuntu-latest, 5.3.2, ., false)	3m 3s
test (ubuntu-latest, 5.3.2, e2e/custom_registry, false)	1m 28s
test (ubuntu-latest, 5.3.2, e2e/wasm, false)	1m 40s
test (ubuntu-latest, 5.3.2, e2e/smoke, false)	1m 49s
test (ubuntu-latest, 5.3.2, e2e/crane_as_registry, false)	44s
	26m 6s

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