Fix terragrunt installation

Author: rriveramdz

src/main.sh

@@ -133,6 +133,7 @@ function installTerragrunt {
   echo "Successfully downloaded Terragrunt ${tgVersion}"
 
   echo "Moving Terragrunt ${tgVersion} to PATH"
+  chmod +x /tmp/terragrunt
   mv /tmp/terragrunt /usr/local/bin
   if [ "${?}" -ne 0 ]; then
     echo "Failed to move Terragrunt ${tgVersion}"