add tflint

Author: Florencia Comuzzi

.github/workflows/terraform-plan.yml

@@ -7,6 +7,38 @@ env:
   TF_WORKSPACE: "production"
   CONFIG_DIRECTORY: "./"
 jobs:
+  tflint:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    steps:
+    - uses: actions/checkout@v4
+      name: Checkout source code
+
+    - uses: actions/cache@v4
+      name: Cache plugin dir
+      with:
+        path: ~/.tflint.d/plugins
+        key: ${{ matrix.os }}-tflint-${{ hashFiles('.tflint.hcl') }}
+
+    - uses: terraform-linters/setup-tflint@v4
+      name: Setup TFLint
+      with:
+        tflint_version: v0.52.0
+    - name: Show version
+      run: tflint --version
+
+    - name: Init TFLint
+      run: tflint --init
+      env:
+        # https://github.com/terraform-linters/tflint/blob/master/docs/user-guide/plugins.md#avoiding-rate-limiting
+        GITHUB_TOKEN: ${{ github.token }}
+
+    - name: Run TFLint
+      run: tflint -f compact
   terraform:
     if: github.repository != 'hashicorp-education/learn-terraform-github-actions'
     name: "Terraform Plan"