Improve tty error logging when buildkit vertex is unknown (#2188)

* Improve tty error logging when buildkit vertex is unknown

Creates a generic "system" group in the tty output which captures
buildkit events that report a non-dagger vertex name. This happens
currently when using core.#Dockerfile actions since Dagger delegates the
LLB generation to buildkit through it's frontend and we don't get
meaningful events that we can correlate from Dagger's side

Signed-off-by: Marcos Lilljedahl <marcosnils@gmail.com>

util/progressui/display.go

@@ -25,9 +25,11 @@ const (
 	defaultDisplayTimeout = 100 * time.Millisecond
 )
 
-type VertexPrintFunc func(v *client.Vertex, index int)
-type StatusPrintFunc func(v *client.Vertex, format string, a ...interface{})
-type LogPrintFunc func(v *client.Vertex, stream int, partial bool, format string, a ...interface{})
+type (
+	VertexPrintFunc func(v *client.Vertex, index int)
+	StatusPrintFunc func(v *client.Vertex, format string, a ...interface{})
+	LogPrintFunc    func(v *client.Vertex, stream int, partial bool, format string, a ...interface{})
+)
 
 func PrintSolveStatus(ctx context.Context, ch chan *client.SolveStatus, vertexPrintCb VertexPrintFunc, statusPrintCb StatusPrintFunc, logPrintCb LogPrintFunc) error {
 	printer := &textMux{
@@ -148,8 +150,10 @@ func DisplaySolveStatus(ctx context.Context, phase string, c console.Console, w
 	}
 }
 
-const termHeight = 6
-const termPad = 10
+const (
+	termHeight = 6
+	termPad    = 10
+)
 
 type displayInfo struct {
 	startTime      time.Time

util/progressui/printer.go

@@ -11,10 +11,12 @@ import (
 	"github.com/tonistiigi/units"
 )
 
-const antiFlicker = 5 * time.Second
-const maxDelay = 10 * time.Second
-const minTimeDelta = 5 * time.Second
-const minProgressDelta = 0.05 // %
+const (
+	antiFlicker      = 5 * time.Second
+	maxDelay         = 10 * time.Second
+	minTimeDelta     = 5 * time.Second
+	minProgressDelta = 0.05 // %
+)
 
 type lastStatus struct {
 	Current   int64