feat: add "key-rotate" command (#709)

backend/internal/cmds/version.go

@@ -0,0 +1,19 @@
+package cmds
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+
+	"github.com/pocket-id/pocket-id/backend/internal/common"
+)
+
+func init() {
+	rootCmd.AddCommand(&cobra.Command{
+		Use:   "version",
+		Short: "Print the version number",
+		Run: func(cmd *cobra.Command, args []string) {
+			fmt.Println("pocket-id " + common.Version)
+		},
+	})
+}