feat: Add --version flag with build-time version injection

Set Cobra's Version field on root command with ldflags support.
GoReleaser config updated to inject git tag version at build time.

Author: Pairadux

.goreleaser.yaml

@@ -20,6 +20,8 @@ builds:
       - linux
       - windows
       - darwin
+    ldflags:
+      - -s -w -X github.com/Pairadux/muxly/cmd.Version={{.Version}}
 
 archives:
   - formats: [tar.gz]

cmd/root.go

@@ -28,9 +28,13 @@ var (
 	verbose     bool
 )
 
+// Version is set at build time via ldflags
+var Version = "dev"
+
 // rootCmd represents the base command when called without any subcommands
 var rootCmd = &cobra.Command{
 	Use:     "muxly [SESSION]",
+	Version: Version,
 	Example: "",
 	Short:   "A tool for quickly opening tmux sessions",
 	Long:    "A tool for quickly opening tmux sessions\n\nBased on ThePrimeagen's tmux-sessionizer script.",