fix: default migration authoring directory to cwd

cmd/corestack-goose/main.go

@@ -21,16 +21,16 @@ func command() *urfavecli.Command {
 	root := &urfavecli.Command{Name: "corestack-goose", Usage: "Author migrations before deployment"}
 	for _, name := range []string{"create", "fix"} {
 		root.Commands = append(root.Commands, &urfavecli.Command{Name: name,
-			Flags: []urfavecli.Flag{&urfavecli.StringFlag{Name: "dir", Required: true}},
+			Flags: []urfavecli.Flag{&urfavecli.StringFlag{Name: "dir", Value: ".", Usage: "Migration directory (defaults to the current working directory)"}},
 			Action: func(_ context.Context, cmd *urfavecli.Command) error {
 				if name == "create" {
 					if cmd.NArg() != 2 {
-						return fmt.Errorf("usage: create --dir <dir> <name> sql|go")
+						return fmt.Errorf("usage: create [--dir <dir>] <name> sql|go")
 					}
 					return authoring.Create(cmd.String("dir"), cmd.Args().Get(0), cmd.Args().Get(1))
 				}
 				if cmd.NArg() != 0 {
-					return fmt.Errorf("usage: fix --dir <dir>")
+					return fmt.Errorf("usage: fix [--dir <dir>]")
 				}
 				return authoring.Fix(cmd.String("dir"))
 			},