Add test for trivy fs

[nayuta]

Add test for trivy fs to check #17, the test was added.

Changes:

• multiple test was supported with GitHub Actions' matrix
  • You can put the test under ./testdata directory with ./testdata/[trivy command]/[platform label]/[with_detections|without_detections]
  • e.g. current terraform test is in ./testdata/config/terraform/with_detections and ./testdata/config/terraform/without_detections

[haya14busa]

Sorry for the late response. Can you resolve the conflicts?

[nayuta]

Thanks. However, the test on Windows failed accidentally. So, I'll check it this weekend.