Fix CI workflow (permissions + GITHUB_TOKEN)

Author: rusets

.github/workflows/iac-ci.yml

@@ -56,6 +56,9 @@ jobs:
       - name: Terraform validate
         run: terraform validate
 
+      - name: Terraform plan
+        run: terraform plan -lock=false -input=false
+
       - name: TFLint
         run: tflint