Support extensions; task kinds; multi-container task pods for providers. #82

Job	Run time
test-api	3m 1s
build-image	2m 18s
fmt	15s
build	2m 13s
test-e2e	8m 51s
vet	1m 24s
test-unit	3m 6s
test-integration / e2e-api-integration-tests	5m 59s
test-integration / e2e-ui-integration-tests (tier0)	29m 17s
	56m 24s

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