ci: enforce yamllint (#264) #251

Job	Run time
permission_check	1s
fetch-regions	6s
tests / permission_check	1s
tests / prepare_matrix	2m 25s
tests / test-integration (tests/config.tftest.hcl)	2m 37s
tests / test-integration (tests/configsubscription.tftest.hcl)	3m 11s
tests / test-integration (tests/firehose.tftest.hcl)	6m 6s
tests / test-integration (tests/forwarder.tftest.hcl)	5m 33s
tests / test-integration (tests/forwarder_s3.tftest.hcl)	4m 1s
tests / test-integration (tests/logwriter.tftest.hcl)	6m 35s
tests / test-integration (tests/metricstream.tftest.hcl)	3m 55s
tests / test-integration (tests/simple.tftest.hcl)	40s
tests / test-integration (tests/stack.tftest.hcl)	8m 51s
tests / cleanup	9s
github-release	15s
aws-release	0s
	44m 26s

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