ci: add cache for tf-lint

Author: babinskiy

.github/workflows/ci.yml

@@ -107,6 +107,11 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+      - uses: actions/cache@v4
+        with:
+          path: $HOME/.tflint.d/plugins
+          key: tflint-${{ runner.os }}-${{ hashFiles('.tflint.hcl') }}
+
       - uses: terraform-linters/setup-tflint@v4
         with:
           tflint_version: "latest"