Print error annotations if inputs fail validation

action.yml

@@ -39,6 +39,19 @@ runs:
         ${{ inputs.harden_runner_egress_policy }} = block ]]
       shell: bash
 
+    - id: harden-runner-egress-policy-verification-failure
+      name: >-
+        Output an annotation if verification of
+        harden_runner_egress_policy input fails
+      run: >-
+        echo ::error:: Input harden_runner_egress_policy is not a
+        valid value.
+      shell: bash
+      if: |
+        ${{ failure() &&
+        steps.verify-harden-runner-egress-policy.conclusion ==
+        'failure' }}
+
     - id: verify-permissions-monitoring-config
       name: Verify that permissions_monitoring_config input is valid JSON
       run: |
@@ -47,6 +60,19 @@ runs:
         EOF
       shell: bash
 
+    - id: verify-permissions-monitoring-config-verification-failure
+      name: >-
+        Output an annotation if verification of
+        permissions_monitoring_config input fails
+      run: >-
+        echo ::error:: Input permissions_monitoring_config is not
+        valid JSON.
+      shell: bash
+      if: |
+        ${{ failure() &&
+        steps.verify-permissions-monitoring-config.conclusion ==
+        'failure' }}
+
     - id: monitor-actions-permissions
       name: Monitor GitHub Actions permissions
       uses: GitHubSecurityLab/actions-permissions/monitor@v1