Use python:3 docker image for build-docs taks
Use python:3 docker image for build-docs taks

yamamoto-febc/terraform-provider-sakuracloud,sacloud/terraform-provider-sakuracloud,sacloud/terraform-provider-sakuracloud,yamamoto-febc/terraform-provider-sakuracloud,yamamoto-febc/terraform-provider-sakuracloud,yamamoto-febc/terraform-provider-sakuracloud