nerdctl silently ignores tmpfs volume configuration

[gtsiam]

Description

nerdctl compose up fails to configure containers with tmpfs volumes and silently creates an anoymous volume instead.

My SSD is not very happy.

Steps to reproduce the issue

1. Create a test compose file with a tmpfs mount:

name: test
services:
  test:
    image: alpine
    volumes:
      - type: tmpfs
        target: /tmp/cache
        tmpfs:
          size: 1073741824 # 1GB

2. Run nerdctl compose up.

Describe the results you received and expected

An anonymous volume is created, instead of the tmpfs configured in compose.yaml:

nerdctl inspect test-test-1 | jq '.[].Mounts[]'

{
  "Type": "volume",
  "Name": "ee5270c6228ed7b8f75b486c151454c68954146ad700063c93754d0b0e6aaf91",
  "Source": "/var/lib/nerdctl/1935db59/volumes/default/ee5270c6228ed7b8f75b486c151454c68954146ad700063c93754d0b0e6aaf91/_data",
  "Destination": "/tmp/cache",
  "Driver": "local",
  "Mode": "",
  "RW": true,
  "Propagation": ""
}

What version of nerdctl are you using?

nerdctl 2.1.6