chore: Add check_terraform job

Author: jongwooo

.github/workflows/check-terraform.yaml

@@ -0,0 +1,28 @@
+name: Ensure Terraform code is properly formatted and valid
+
+on:
+  pull_request:
+    paths:
+      - infrastructure/**/*.tf
+  push:
+
+jobs:
+  check_terraform:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out the repository code
+        uses: actions/checkout@v4
+
+      - name: Set up the Terraform CLI
+        uses: hashicorp/setup-terraform@v3
+
+      - name: Initialize the Terraform working directory
+        run: terraform init -backend=false
+
+      - name: Verify that all Terraform files are properly formatted
+        run: terraform fmt -recursive -check
+
+      - name: Validate the Terraform configuration files
+        run: terraform validate
+