Add GH action to run terraform fmt

.github/workflows/terraform-fmt.yaml

@@ -0,0 +1,18 @@
+name: Run terraform fmt
+on:
+  pull_request:
+
+jobs:
+  terraform:
+    name: terraform fmt
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup Terraform
+        uses: hashicorp/setup-terraform@v1
+
+      - name: Terraform Format
+        run: terraform fmt -check -recursive