bigqueryreservation: add principal field to ReservationAssignment

mmv1/products/bigqueryreservation/ReservationAssignment.yaml

@@ -60,6 +60,16 @@ samples:
           reservation_name: 'example-reservation'
         test_env_vars:
           project: 'PROJECT_NAME'
+  - name: 'bigquery_reservation_assignment_full_with_principal'
+    primary_resource_id: 'assignment'
+    exclude_basic_doc: true
+    steps:
+      - name: 'bigquery_reservation_assignment_full_with_principal'
+        resource_id_vars:
+          reservation_name: 'example-reservation'
+        test_env_vars:
+          project: 'PROJECT_NAME'
+          service_account: 'SERVICE_ACCT'
 parameters:
   - name: 'location'
     type: String
@@ -91,6 +101,14 @@ properties:
     description: |
       Types of job, which could be specified when using the reservation. Possible values: JOB_TYPE_UNSPECIFIED, PIPELINE, QUERY, CONTINUOUS
     required: true
+  - name: 'principal'
+    type: String
+    description: |
+      Optional. Represents the principal for this assignment. If not empty, jobs run by this principal will utilize the associated reservation. Otherwise, jobs will fall back to using the reservation assigned to the project, folder, or organization (in that order). If no reservation is assigned at any of these levels, on-demand capacity will be used. The supported formats are:
+      * `principal://goog/subject/USER_EMAIL_ADDRESS` for users,
+      * `principal://iam.googleapis.com/projects/-/serviceAccounts/SA_EMAIL_ADDRESS` for service accounts,
+      * `principal://iam.googleapis.com/projects/PROJECT_NUMBER/locations/global/workloadIdentityPools/POOL_ID/subject/SUBJECT_ID` for workload identity pool identities.
+      * The special value `unknown_or_deleted_user` represents principals which cannot be read from the user info service, for example deleted users.
   - name: 'state'
     type: String
     description: |

mmv1/templates/terraform/samples/services/bigqueryreservation/bigquery_reservation_assignment_full_with_principal.tf.tmpl

@@ -0,0 +1,15 @@
+resource "google_bigquery_reservation" "basic" {
+  name  = "{{index $.ResourceIdVars "reservation_name"}}"
+  project = "{{index $.TestEnvVars "project"}}"
+  location = "us-central1"
+  slot_capacity = 0
+  ignore_idle_slots = false
+}
+
+resource "google_bigquery_reservation_assignment" "{{$.PrimaryResourceId}}" {
+  assignee  = "projects/{{index $.TestEnvVars "project"}}"
+  job_type = "QUERY"
+  location = "us-central1"
+  principal = "principal://iam.googleapis.com/projects/-/serviceAccounts/{{index $.TestEnvVars "service_account"}}"
+  reservation = google_bigquery_reservation.basic.id
+}