bake in v.0.8.0 does not support compose services with dots

[cinder-fish]

E.g.

docker-compose.yml

version: '3.4'

services:
  app2.4:
    image: test:latest
    build: .

Output:

$ docker buildx bake
[+] Building 0.0s (0/0)                                                                                                                                                                                                                                                          
error: invalid service name "app2.4": only "[a-zA-Z0-9_-]+" are allowed

Version:

$ docker buildx version
github.com/docker/buildx v0.8.0 c8f7c1e93ffa9cfcf926cd3e6450af957f235b07

docker compose build will still build this service. as will bake from github.com/docker/buildx v0.7.1 05846896d149da05f3d6fd1e7770da187b52a247.

Mainly looking for advice, is this change intentional? Will it eventually apply to compose too?

[crazy-max]

@cinder-fish Indeed we might need to be aligned with compose spec: https://github.com/compose-spec/compose-go/blob/e3cf2790536b2a6110a5f9cd81da580775d1f9c4/schema/compose-spec.json#L23