feat(WHE-28): add terraform baseline for cloud run and scheduler

.github/workflows/ci.yml

@@ -75,3 +75,25 @@ jobs:
               exit 1
               ;;
           esac
+
+  terraform:
+    name: Terraform / validate
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Terraform
+        uses: hashicorp/setup-terraform@v3
+        with:
+          terraform_version: 1.8.5
+
+      - name: Terraform format check
+        run: terraform -chdir=infra/terraform fmt -check -recursive
+
+      - name: Terraform validate
+        run: |
+          terraform -chdir=infra/terraform init -backend=false
+          terraform -chdir=infra/terraform validate