Tests

Add test for `trivy fs` #55

Job	Run time
setup	5s
trivy (ubuntu-latest)	13s
trivy (macos-latest)	16s
trivy (windows-latest)	19s
trivy (github-pr-check)	13s
trivy (github-pr-review)	8s
trivy (github-check) (./testdata/config/terraform/with_detections, config, with_detections, confi...	12s
trivy (github-check) (./testdata/config/terraform/without_detections, config, without_detections,...	13s
trivy (github-check) (./testdata/fs/npm/with_detections, fs, with_detections, fs/npm)	9s
trivy (github-check) (./testdata/fs/npm/without_detections , fs, without_detections , fs/npm)	6s
	1m 54s

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