Created Terraform sample to enable Private Preview features (#906)

* Created Terraform sample to enable Private Preview features

* Updated project

* skip this test: requires policy changes to implement, unable to do in CI

---------

Co-authored-by: Katie McLaughlin <katie@glasnt.com>
Co-authored-by: Katie McLaughlin <glasnt@google.com>

Author: davide-zanon

compute/preview_feature/enable/main.tf

@@ -0,0 +1,29 @@
+/**
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+# [START compute_preview_feature_enable]
+
+resource "google_compute_preview_feature" "default" {
+  name              = "alpha-api-access"
+  activation_status = "ENABLED"
+  rollout_operation {
+    rollout_input {
+      predefined_rollout_plan = "ROLLOUT_PLAN_FAST_ROLLOUT"
+    }
+  }
+}
+
+# [END compute_preview_feature_enable]

compute/preview_feature/enable/test.yaml

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+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+apiVersion: blueprints.cloud.google.com/v1alpha1
+kind: BlueprintTest
+metadata:
+  name: compute_preview_feature_enable
+spec:
+  skip: true