ci: do not run full application build/tests for docs-only changes #412

Job	Run time
changes	5s
build	28s
unit-test (macos-latest)	1m 19s
unit-test (ubuntu-latest)	1m 30s
unit-test (windows-latest)	1m 36s
integration-test (windows-latest)	1m 50s
integration-test (ubuntu-latest)	1m 3s
integration-test (macos-latest)	1m 37s
	9m 28s

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