Tests

Add test for `trivy fs` #126

Job	Run time
setup	3s
trivy (github-pr-review)	8s
trivy (github-pr-check)	10s
trivy (ubuntu-latest)	8s
trivy (macos-latest)	11s
trivy (windows-latest)	17s
trivy (github-check) (./testdata/fs/npm/without_detections, fs, without_detections, fs/npm)	8s
trivy (github-check) (./testdata/fs/npm/with_detections, fs, with_detections, fs/npm)	2m 44s
trivy (github-check) (./testdata/config/terraform/without_detections, config, without_detections,...	7s
trivy (github-check) (./testdata/config/terraform/with_detections , config, with_detections , con...	3s
	3m 59s

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