Add bastion_shape required flag

Author: MarcinZablocki

schema.yaml

@@ -190,6 +190,7 @@ variables:
     type: oci:core:instanceshape:name
     dependsOn:
       compartmentId: ${targetCompartment}
+    required: true
   bastion_ocpus:
     type: integer
     description: Number of OCPU's for flex shape
@@ -970,4 +971,4 @@ variables:
     visible: 
       and:
         - ${autoscaling}
-        - ${autoscaling_monitoring}
+        - ${autoscaling_monitoring}