ci: add RELEASE_NOTE.md to .gitignore #985

Job	Run time
build (amd64)	23s
cleanup-runs	7s
install-tparse	10s
split-test-files	13s
test-upgrade-name	6s
test-integration-multi-node (00)	17s
test-integration (00)	16s
test-integration-multi-node (01)	22s
tests (00)	19s
test-integration (01)	24s
test-integration-multi-node (02)	18s
tests (01)	15s
test-integration (02)	19s
test-integration-multi-node (03)	17s
tests (02)	17s
test-integration (03)	15s
tests (03)	24s
test-integration-report	7s
test_integration_multi_node_report	8s
upload-coverage-report	9s
test-localnet-blocks	3m 20s
	8m 26s

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