Add --labels support in docker example (#51)

examples/dockerscaleset/README.md

@@ -40,6 +40,7 @@ You'll then need:
 |------|----------|-------------|
 | `--url` | Yes | Registration target (org, repo, or enterprise URL, e.g. `https://github.com/org/repo`). |
 | `--name` | Yes | Runner scale set name (must be unique within the runner group). |
+| `--labels` | No | Labels for workflow targeting (comma-separated or repeated). Defaults to `--name` if not provided. |
 | `--max-runners` | No | Upper bound of concurrently provisioned runners (default 10). |
 | `--min-runners` | No | Lower bound to maintain (default 0). |
 | `--runner-group` | No | Runner group name (default `default`). |

examples/dockerscaleset/config.go

@@ -15,6 +15,7 @@ type Config struct {
 	MaxRunners      int
 	MinRunners      int
 	ScaleSetName    string
+	Labels          []string
 	RunnerGroup     string
 	GitHubApp       scaleset.GitHubAppAuth
 	Token           string
@@ -47,6 +48,11 @@ func (c *Config) Validate() error {
 	if c.ScaleSetName == "" {
 		return fmt.Errorf("scale set name is required")
 	}
+	for i, label := range c.Labels {
+		if strings.TrimSpace(label) == "" {
+			return fmt.Errorf("label at index %d is empty", i)
+		}
+	}
 	if c.MaxRunners < c.MinRunners {
 		return fmt.Errorf("max runners cannot be less than min-runners")
 	}
@@ -120,3 +126,16 @@ func (c *Config) Logger() *slog.Logger {
 		return slog.New(slog.DiscardHandler)
 	}
 }
+
+// BuildLabels returns the labels to use for the runner scale set.
+// If custom labels are provided, those are used; otherwise, the scale set name is used as the label.
+func (c *Config) BuildLabels() []scaleset.Label {
+	if len(c.Labels) > 0 {
+		labels := make([]scaleset.Label, len(c.Labels))
+		for i, name := range c.Labels {
+			labels[i] = scaleset.Label{Name: strings.TrimSpace(name)}
+		}
+		return labels
+	}
+	return []scaleset.Label{{Name: c.ScaleSetName}}
+}

examples/dockerscaleset/main.go

@@ -23,6 +23,7 @@ func init() {
 	flags.IntVar(&cfg.MaxRunners, "max-runners", 10, "Maximum number of runners")
 	flags.IntVar(&cfg.MinRunners, "min-runners", 0, "Minimum number of runners")
 	flags.StringVar(&cfg.ScaleSetName, "name", "", "REQUIRED: Name of your scale set")
+	flags.StringSliceVar(&cfg.Labels, "labels", nil, "Labels for workflow targeting (comma-separated or repeated). Defaults to --name if not provided.")
 	flags.StringVar(&cfg.RunnerGroup, "runner-group", scaleset.DefaultRunnerGroup, "Name of the runner group your scale set should belong to")
 	flags.StringVar(&cfg.GitHubApp.ClientID, "app-client-id", "", "GitHub App client id")
 	flags.Int64Var(&cfg.GitHubApp.InstallationID, "app-installation-id", 0, "GitHub App installation ID")
@@ -77,11 +78,7 @@ func run(ctx context.Context, c Config) error {
 	scaleSet, err := scalesetClient.CreateRunnerScaleSet(ctx, &scaleset.RunnerScaleSet{
 		Name:          c.ScaleSetName,
 		RunnerGroupID: runnerGroupID,
-		Labels: []scaleset.Label{
+		Labels:        c.BuildLabels(),
-			{
-				Name: c.ScaleSetName,
-			},
-		},
 		RunnerSetting: scaleset.RunnerSetting{
 			DisableUpdate: true,
 		},