Add terraform linting workflow

Author: Tsingis

.github/workflows/terraform.yml

@@ -0,0 +1,41 @@
+name: terraform
+on:
+  pull_request:
+    branches:
+      - master
+    paths:
+      - "terraform/**"
+      - ".github/workflows/terraform.yml"
+  push:
+    branches:
+      - master
+    paths:
+      - "terraform/**"
+      - ".github/workflows/terraform.yml"
+  schedule:
+    - cron: "0 21 1 * 0"
+  workflow_dispatch:
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+jobs:
+  terraform:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@v5
+      - name: Setup TFLint
+        uses: terraform-linters/setup-tflint@v4
+        with:
+          tflint_version: "latest"
+          tflint_wrapper: false
+      - name: Init TFLint
+        run: tflint --init
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        working-directory: ./terraform
+      - name: Terraform linting
+        id: tflint
+        run: tflint -f compact --minimum-failure-severity notice
+        working-directory: ./terraform

terraform/.tflint.hcl

@@ -0,0 +1,10 @@
+plugin "terraform" {
+  enabled = true
+  preset  = "recommended"
+}
+
+plugin "azurerm" {
+    enabled    = true
+    version    = "0.29.0"
+    source     = "github.com/terraform-linters/tflint-ruleset-azurerm"
+}

terraform/versions.tf

@@ -6,5 +6,10 @@ terraform {
       source  = "hashicorp/azurerm"
       version = ">= 4.42.0"
     }
+
+    external = {
+      source  = "hashicorp/external"
+      version = ">= 2.3.5"
+    }
   }
 }