chore: add lint job

.github/workflows/lint.yaml

@@ -0,0 +1,38 @@
+name: Lint
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  tflint:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+
+    steps:
+    - uses: actions/checkout@v2
+      name: Checkout source code
+
+    - uses: actions/cache@v2
+      name: Cache plugin dir
+      with:
+        path: ~/.tflint.d/plugins
+        key: ${{ matrix.os }}-tflint-${{ hashFiles('.tflint.hcl') }}
+
+    - uses: terraform-linters/setup-tflint@v1
+      name: Setup TFLint
+      with:
+        tflint_version: v0.29.0
+
+    - name: Show version
+      run: tflint --version
+
+    - name: Init TFLint
+      run: tflint --init
+
+    - name: Run TFLint
+      run: tflint -f compact