Add Terraform validation GitHub Action

🤖 Generated with Claude Code
Co-Authored-By: Claude <noreply@anthropic.com>

Author: gAmUssA

.github/workflows/terraform-validate.yml

@@ -0,0 +1,36 @@
+name: "Terraform Validate"
+
+on:
+  pull_request:
+    paths:
+      - 'terraform/**'
+      - '.github/workflows/terraform-validate.yml'
+
+env:
+  TF_VERSION: "1.7.5"
+
+jobs:
+  terraform-validate:
+    name: "Terraform Validate"
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./terraform
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Terraform
+        uses: hashicorp/setup-terraform@v3
+        with:
+          terraform_version: ${{ env.TF_VERSION }}
+
+      - name: Terraform Init
+        run: terraform init -backend=false
+      
+      - name: Terraform Format
+        run: terraform fmt -check
+      
+      - name: Terraform Validate
+        run: terraform validate