ci: add RELEASE_NOTE.md to .gitignore #984

Job	Run time
install-tparse	26s
cleanup-runs	5s
build (amd64)	13s
test-upgrade-name	8s
split-test-files	10s
tests (00)	18s
test-integration-multi-node (00)	19s
tests (01)	16s
test-integration (00)	19s
test-integration-multi-node (01)	23s
tests (02)	21s
test-integration (01)	23s
test-integration-multi-node (02)	22s
tests (03)	24s
test-integration (02)	17s
test-integration-multi-node (03)	18s
test-integration (03)	16s
test_integration_multi_node_report	9s
test-integration-report	5s
test-localnet-blocks	2m 57s
upload-coverage-report	9s
	8m 18s

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