Support scanning infrastructure as code files with Trivy

[ferrarimarco]

Is your feature request related to a problem? Please describe.
Support Trivy: https://github.com/aquasecurity/trivy

[zylent]

Sorry for the extra comment, wrong account. This is up my alley - I'll review your wiki and guidelines before 100% committing but I would love to work on this.

[owenrumney]

Worth mentioning that tfsec is now tfsec/tfsec

There are lots more features being added and the check count is growing steadily

[github-actions]

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[ferrarimarco]

We can update this because tfsec developers are encouraging the migration to Trivy. Updating the this report to reflect that.

[ferrarimarco]

Useful pointers:

• Container image: https://aquasecurity.github.io/trivy/v0.48/getting-started/installation/#use-container-image
• Run against files and dirs: https://aquasecurity.github.io/trivy/v0.48/docs/target/filesystem/
• Configuration file: https://aquasecurity.github.io/trivy/v0.48/docs/configuration/#configuration-file