feat: add option to support buildx --label flag (#132)

_docs/data/data.yaml

@@ -221,3 +221,8 @@ properties:
     description: Target platforms for build.
     type: list
     required: false
+
+  labels:
+    description: Labels to add to the image.
+    type: list
+    required: false

cmd/drone-docker-buildx/config.go

@@ -297,5 +297,12 @@ func settingsFlags(settings *plugin.Settings, category string) []cli.Flag {
 			Destination: &settings.Build.Platforms,
 			Category:    category,
 		},
+		&cli.StringSliceFlag{
+			Name:        "labels",
+			EnvVars:     []string{"PLUGIN_LABELS"},
+			Usage:       "labels to add to image",
+			Destination: &settings.Build.Labels,
+			Category:    category,
+		},
 	}
 }

plugin/docker.go

@@ -123,6 +123,10 @@ func commandBuild(build Build, dryrun bool) *exec.Cmd {
 		args = append(args, "-t", fmt.Sprintf("%s:%s", build.Repo, arg))
 	}
 
+	for _, arg := range build.Labels.Value() {
+		args = append(args, "--label", arg)
+	}
+
 	return exec.Command(dockerExe, args...)
 }
 

plugin/impl.go

@@ -61,6 +61,7 @@ type Build struct {
 	Quiet        bool            // Docker build quiet
 	Output       string          // Docker build output folder
 	NamedContext cli.StringSlice // Docker build named context
+	Labels       cli.StringSlice // Docker build labels
 }
 
 // Settings for the Plugin.