feat(terraform): add trivy (#5100)

* feat(terraform): add trivy

* fixup! feat(terraform): add trivy

---------

Co-authored-by: cos <cos>

doc/ale-terraform.txt

@@ -139,6 +139,30 @@ g:ale_terraform_tflint_options
   to include '-f json' in your new value.
 
 
+===============================================================================
+trivy                                                     *ale-terraform-trivy*
+
+                                       *ale-options.terraform_trivy_executable*
+                                             *g:ale_terraform_trivy_executable*
+                                             *b:ale_terraform_trivy_executable*
+terraform_trivy_executable
+g:ale_terraform_trivy_executable
+  Type: |String|
+  Default: `'trivy'`
+
+  This variable can be changed to use a different executable for trivy.
+
+                                          *ale-options.terraform_trivy_options*
+                                                *g:ale_terraform_trivy_options*
+                                                *b:ale_terraform_trivy_options*
+terraform_trivy_options
+g:ale_terraform_trivy_options
+  Type: |String|
+  Default: `''`
+
+  This variable can be changed to pass custom CLI flags to trivy.
+
+
 ===============================================================================
 tfsec                                                     *ale-terraform-tfsec*