Print error annotations if inputs fail validation

action.yml

@@ -36,15 +36,16 @@ runs:
       name: Verify that harden_runner_egress_policy input is a valid value
       run: >-
         [[ ${{ inputs.harden_runner_egress_policy }} = audit ||
-        ${{ inputs.harden_runner_egress_policy }} = block ]]
+        ${{ inputs.harden_runner_egress_policy }} = block ]] ||
+        echo ::error Input harden_runner_egress_policy is not a valid value.
       shell: bash
 
     - id: verify-permissions-monitoring-config
       name: Verify that permissions_monitoring_config input is valid JSON
       run: |
         jq . >> /dev/null <<EOF
         ${{ inputs.permissions_monitoring_config }}
-        EOF
+        EOF || echo ::error Input permissions_monitoring_config is not valid JSON.
       shell: bash
 
     - id: monitor-actions-permissions