Support for scanning changed files only (IaC mode)

[dstrates]

Trivy-action does not offer the ability to scan changed files only (i.e. files introduced or modified in a pull request).

Instead it scans all files in a directory, or specified files only. This increases scanning time unnecessarily during the CI process.

[alwatt]

bump

[simar7]

Trivy action only supports what Trivy has to offer. Currently Trivy does not offer this feature in the open source version.

[hajdukda]

Trivy action only supports what Trivy has to offer. Currently Trivy does not offer this feature in the open source version.

Come on its a simple for_each in bash..