fix(terraform_plan): set tf_actions_plan_has_changes if exit code is 0 (hashicorp#136)

Author: philippschulte

src/terraform_plan.sh

@@ -13,6 +13,7 @@ function terraformPlan {
     echo "plan: info: successfully planned Terraform configuration in ${tfWorkingDir}"
     echo "${planOutput}"
     echo
+    echo ::set-output name=tf_actions_plan_has_changes::${planHasChanges}
     exit ${planExitCode}
   fi