build: read body response to check for erroneous image export to docker

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

util/progress/fromreader.go

@@ -1,37 +0,0 @@
-package progress
-
-import (
-	"io"
-	"time"
-
-	"github.com/moby/buildkit/client"
-	"github.com/moby/buildkit/identity"
-	"github.com/opencontainers/go-digest"
-)
-
-func FromReader(w Writer, name string, rc io.ReadCloser) {
-	dgst := digest.FromBytes([]byte(identity.NewID()))
-	tm := time.Now()
-
-	vtx := client.Vertex{
-		Digest:  dgst,
-		Name:    name,
-		Started: &tm,
-	}
-
-	w.Write(&client.SolveStatus{
-		Vertexes: []*client.Vertex{&vtx},
-	})
-
-	_, err := io.Copy(io.Discard, rc)
-
-	tm2 := time.Now()
-	vtx2 := vtx
-	vtx2.Completed = &tm2
-	if err != nil {
-		vtx2.Error = err.Error()
-	}
-	w.Write(&client.SolveStatus{
-		Vertexes: []*client.Vertex{&vtx2},
-	})
-}