fix: [#ci] initialize OpenTofu before validation in CI tests

- Add automatic OpenTofu/Terraform initialization in test-unit-config.sh
- Fixes CI workflow failure where 'tofu validate' requires 'tofu init' first
- Check for .terraform directory existence before running validation
- Initialize silently to avoid test output clutter
- Maintains backward compatibility with already-initialized environments
- Resolves GitHub Actions workflow validation errors

This ensures the configuration validation test works correctly in both:
- Local environments (where tofu init has been run manually)
- CI environments (where the working directory is clean)

Tested scenarios:
- Pre-initialized environment (existing behavior preserved)
- Clean environment (auto-initialization works correctly)
- Full CI test suite passes with this fix

Author: josecelano

infrastructure/tests/test-unit-config.sh

@@ -63,13 +63,31 @@ test_terraform_syntax() {
 
     # Test Terraform syntax
     if command -v tofu >/dev/null 2>&1; then
+        # Initialize if not already done (required for validation)
+        if [[ ! -d ".terraform" ]]; then
+            log_info "Initializing OpenTofu (required for validation)..."
+            if ! tofu init >/dev/null 2>&1; then
+                log_error "OpenTofu initialization failed"
+                return 1
+            fi
+        fi
+
         if ! tofu validate >/dev/null 2>&1; then
             log_error "OpenTofu validation failed"
             failed=1
         else
             log_success "OpenTofu configuration is valid"
         fi
     elif command -v terraform >/dev/null 2>&1; then
+        # Initialize if not already done (required for validation)
+        if [[ ! -d ".terraform" ]]; then
+            log_info "Initializing Terraform (required for validation)..."
+            if ! terraform init >/dev/null 2>&1; then
+                log_error "Terraform initialization failed"
+                return 1
+            fi
+        fi
+
         if ! terraform validate >/dev/null 2>&1; then
             log_error "Terraform validation failed"
             failed=1