ci: added govulscan security scanner tool #124

Job	Run time
Lint	20s
Unit tests (macos-latest, oldstable)	45s
Unit tests (ubuntu-latest, stable)	36s
Unit tests (macos-latest, stable)	39s
Unit tests (windows-latest, oldstable)	1m 2s
Unit tests (ubuntu-latest, oldstable)	15s
Unit tests (windows-latest, stable)	1m 9s
collect test reports	29s
tests completed	2s
collect test coverage	6s
	5m 23s

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