docker/builder: convert labels map to non-pointer values

Signed-off-by: Nathan Sullivan <nathan@nightsys.net>

Author: CpuID

docker/builder/builder.go

@@ -91,6 +91,12 @@ func (d *DaemonBuilder) Build(ctx context.Context, imageName string) error {
 		outFd, isTerminalOut = term.GetFdInfo(w)
 	}
 
+	// Convert map[string]*string to map[string]string
+	labels := make(map[string]string)
+	for lk, lv := range d.Labels {
+		labels[lk] = *lv
+	}
+
 	response, err := d.Client.ImageBuild(ctx, body, types.ImageBuildOptions{
 		Tags:        []string{imageName},
 		NoCache:     d.NoCache,
@@ -101,7 +107,7 @@ func (d *DaemonBuilder) Build(ctx context.Context, imageName string) error {
 		AuthConfigs: d.AuthConfigs,
 		BuildArgs:   d.BuildArgs,
 		CacheFrom:   d.CacheFrom,
-		Labels:      d.Labels,
+		Labels:      labels,
 		NetworkMode: d.Network,
 		Target:      d.Target,
 	})