Hmmm.. does kubernetes now require CGO or something? Or are they no longer compatible with go1.16?

GOOS=linux GOARCH=arm CGO_ENABLED=0 go build -trimpath -ldflags="-s -w -X github.com/docker/compose/v2/internal.Version=v2.3.4"  -o /usr/libexec/docker/cli-plugins/docker-compose ./cmd
# sigs.k8s.io/json/internal/golang/encoding/json
/go/pkg/mod/sigs.k8s.io/json@v0.0.0-20211020170558-c049b76a60c6/internal/golang/encoding/json/encode.go:1249:12: sf.IsExported undefined (type reflect.StructField has no field or method IsExported)
/go/pkg/mod/sigs.k8s.io/json@v0.0.0-20211020170558-c049b76a60c6/internal/golang/encoding/json/encode.go:1255:18: sf.IsExported undefined (type reflect.StructField has no field or method IsExported)

CGO, not JSON (lol.. in two chats at the same time) 😂

Guessing this could be related; looks like they copy Golang's code into their own repository; kubernetes-sigs/json@80fe866

Dependency was added as part of docker/compose#9254 (not 100% sure where buildx requires/uses kubernetes in the client side) @crazy-max probably knows

So that depends on Go 1.17 indeed, which introduced the IsExported() function; golang/go@b83d073

As discussed with @thaJeztah you should have the same replaces in compose: https://github.com/docker/buildx/blob/1ca30a58c2f25a7f72a2fdb5d62e82bf1e2fa37c/go.mod#L62-L64. See also docker/buildx#948

Opened docker/compose#9317 to pin the dependencies (but will need a new release after that)

We updated master to go1.17, and I kicked CI for this PR

If we want to ship an updated version of compose before docker 22.xx is released, we need to have docker/compose#9317 merged and a new version of compose

(this PR on master we can merge if CI goes green)