feat(cloud_sql): add MySQL and PG samples for Read Pool

cloud_sql/mysql_instance_read_pool/main.tf

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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.
+ */
+
+# [START cloud_sql_mysql_read_pool]
+
+resource "google_sql_database_instance" "primary" {
+  name             = "mysql-primary"
+  database_version = "MYSQL_8_0"
+  region           = "europe-west4"
+
+  instance_type = "CLOUD_SQL_INSTANCE"
+
+  # If you wish to, set deletion_protection to true to prevent
+  # accidental deletion of this instance as a result of removing the
+  # Terraform resource.
+  deletion_protection = false
+
+  settings {
+    tier    = "db-perf-optimized-N-2"
+    edition = "ENTERPRISE_PLUS"
+
+    backup_configuration {
+      enabled            = true
+      binary_log_enabled = true
+    }
+
+    ip_configuration {
+      ipv4_enabled = true
+    }
+  }
+}
+
+resource "google_sql_database_instance" "replica" {
+  name             = "mysql-replica"
+  database_version = "MYSQL_8_0"
+  region           = "europe-west4"
+
+  master_instance_name = google_sql_database_instance.primary.name
+  instance_type        = "READ_POOL_INSTANCE"
+  node_count           = 2
+
+  # If you wish to, set deletion_protection to true to prevent
+  # accidental deletion of this instance as a result of removing the
+  # Terraform resource.
+  deletion_protection = false
+
+  settings {
+    tier    = "db-perf-optimized-N-2"
+    edition = "ENTERPRISE_PLUS"
+
+    ip_configuration {
+      ipv4_enabled = true
+    }
+  }
+}
+
+# [END cloud_sql_mysql_read_pool]

cloud_sql/mysql_instance_read_pool/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: sql_mysql_instance_read_pool
+spec:
+  skip: true

cloud_sql/postgres_instance_read_pool/main.tf

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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.
+ */
+
+# [START cloud_sql_postgres_read_pool]
+
+resource "google_sql_database_instance" "primary" {
+  name             = "postgres-primary"
+  database_version = "POSTGRES_15"
+  region           = "europe-west4"
+
+  instance_type = "CLOUD_SQL_INSTANCE"
+
+  # If you wish to, set deletion_protection to true to prevent
+  # accidental deletion of this instance as a result of removing the
+  # Terraform resource.
+  deletion_protection = false
+
+  settings {
+    tier    = "db-perf-optimized-N-2"
+    edition = "ENTERPRISE_PLUS"
+
+    backup_configuration {
+      enabled = true
+    }
+
+    ip_configuration {
+      ipv4_enabled = true
+    }
+  }
+}
+
+resource "google_sql_database_instance" "replica" {
+  name             = "postgres-replica"
+  database_version = "POSTGRES_15"
+  region           = "europe-west4"
+
+  master_instance_name = google_sql_database_instance.primary.name
+  instance_type        = "READ_POOL_INSTANCE"
+  node_count           = 2
+
+  # If you wish to, set deletion_protection to true to prevent
+  # accidental deletion of this instance as a result of removing the
+  # Terraform resource.
+  deletion_protection = false
+
+  settings {
+    tier    = "db-perf-optimized-N-2"
+    edition = "ENTERPRISE_PLUS"
+
+    ip_configuration {
+      ipv4_enabled = true
+    }
+  }
+}
+
+# [END cloud_sql_postgres_read_pool]

cloud_sql/postgres_instance_read_pool/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: sql_postgres_instance_read_pool
+spec:
+  skip: true