fix(cli): completion requires HCLOUD_TOKEN (#19)

The current setup of the CLI requires the user to set HCLOUD_TOKEN for
every single invocation of the binary. Even if we just want to
autocomplete some arguments or even generate the completion scripts in
CI.

This fixes the bug by only initializing the hcloud-go client in the
"cleanup" and "upload" subcommands.

cmd/root.go

@@ -1,7 +1,6 @@
 package cmd
 
 import (
-	"context"
 	"log/slog"
 	"os"
 	"time"
@@ -46,8 +45,6 @@ var rootCmd = &cobra.Command{
 		logger := slog.Default()
 		ctx = contextlogger.New(ctx, logger)
 		cmd.SetContext(ctx)
-
-		client = newClient(ctx)
 	},
 }
 
@@ -71,7 +68,15 @@ func initLogger() *slog.Logger {
 
 }
 
-func newClient(ctx context.Context) *hcloudimages.Client {
+func initClient(cmd *cobra.Command, _ []string) {
+	if client != nil {
+		// Only init if not set.
+		// Theoretically this is not safe against data races and should use [sync.Once], but :shrug:
+		return
+	}
+
+	ctx := cmd.Context()
+
 	logger := contextlogger.From(ctx)
 	// Build hcloud-go client
 	if os.Getenv("HCLOUD_TOKEN") == "" {
@@ -89,7 +94,7 @@ func newClient(ctx context.Context) *hcloudimages.Client {
 		opts = append(opts, hcloud.WithDebugWriter(os.Stderr))
 	}
 
-	return hcloudimages.NewClient(hcloud.NewClient(opts...))
+	client = hcloudimages.NewClient(hcloud.NewClient(opts...))
 }
 
 func Execute() {