Trivy ignore file is working

To exclude CVEs from trivy scan, add a .trivyignore file to the
workspace.
The workspace is mounted to the docker container and therefore the
.trivyignore file is integrated into the scan process, if it exists

src/com/cloudogu/ces/cesbuildlib/Trivy.groovy

@@ -56,7 +56,6 @@ class Trivy implements Serializable {
             default:
                 script.error("Error during trivy scan; exit code: " + exitCode)
         }
-        // TODO: Include .trivyignore file, if existent. Do not fail if .trivyignore file does not exist.
     }
 
     /**