Broken buildkitd config doesn't prevent creating a new builder

[dvdksn]

Contributing guidelines

• I've read the contributing guidelines and wholeheartedly agree

I've found a bug and checked that ...

• ... the documentation does not mention anything about my problem
• ... there are no open or closed issues that are related to my problem

Description

Buildx does not prevent you from creating a new builder with a broken buildkitd config, but then it does not allow you to remove the builder if you did create it.

Expected behaviour

I should not be able to create a broken builder.

Actual behaviour

$ cat cfg.toml 
[worker.oci]
	gc = "maybe"
$ docker buildx create --name=bad_builder --buildkitd-config cfg.toml 
ERROR: failed to parse config: (5, 5): Can't convert maybe(string) to bool
$ docker buildx ls
NAME/NODE           DRIVER/ENDPOINT     STATUS    BUILDKIT   PLATFORMS
default             docker                                   
 \_ default          \_ default         running   v0.17.3    linux/amd64 (+2), linux/arm64, linux/arm (+2), linux/ppc64le, (3 more)
desktop-linux*      docker                                   
 \_ desktop-linux    \_ desktop-linux   running   v0.17.3    linux/amd64 (+2), linux/arm64, linux/arm (+2), linux/ppc64le, (3 more)
bad_builder         docker-container    error                

Cannot load builder bad_builder: failed to parse config: (5, 5): Can't convert maybe(string) to bool
$ docker buildx rm bad_builder
failed to remove bad_builder: failed to parse config: (5, 5): Can't convert maybe(string) to bool
ERROR: failed to remove one or more builders

Buildx version

github.com/docker/buildx 3e3242c 3e3242c

Docker info

Builders list

NAME/NODE           DRIVER/ENDPOINT     STATUS    BUILDKIT   PLATFORMS
default             docker                                   
 \_ default          \_ default         running   v0.17.3    linux/amd64 (+2), linux/arm64, linux/arm (+2), linux/ppc64le, (3 more)
desktop-linux*      docker                                   
 \_ desktop-linux    \_ desktop-linux   running   v0.17.3    linux/amd64 (+2), linux/arm64, linux/arm (+2), linux/ppc64le, (3 more)
bad_builder         docker-container    error

Configuration

[worker.oci]
	gc = "maybe"

Build logs

Additional info

No response