Bucket - Change the visibility of the bucket to Private

The following example policy will filter all the buckets based on a tag and sets the visibility to private

policies:
- name: set-private-bucket
  description: Filter the buckets and set the visibility to private
  resource: oci.bucket
  filters:
   - type: value
     key: "freeform_tags.public_access"
     value: 'true'
     op: eq
  actions:
   - type: update
     public_access_type: 'NoPublicAccess'