Switch cmd/ to use constructor functions. (#36962)

This is a step towards potentially splitting command groups into their
own folders to clean up `cmd/` as one folder for all cli commands.
Returning fresh command instances will also aid in adding tests as you
don't need to concern yourself with the whole command tree being one
mutable variable.

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

cmd/keys.go

@@ -15,40 +15,42 @@ import (
 	"github.com/urfave/cli/v3"
 )
 
-// CmdKeys represents the available keys sub-command
-var CmdKeys = &cli.Command{
-	Name:        "keys",
-	Usage:       "(internal) Should only be called by SSH server",
-	Hidden:      true, // internal commands shouldn't be visible
-	Description: "Queries the Gitea database to get the authorized command for a given ssh key fingerprint",
-	Before:      PrepareConsoleLoggerLevel(log.FATAL),
-	Action:      runKeys,
-	Flags: []cli.Flag{
-		&cli.StringFlag{
-			Name:    "expected",
-			Aliases: []string{"e"},
-			Value:   "git",
-			Usage:   "Expected user for whom provide key commands",
+// NewKeysCommand returns the internal SSH key lookup sub-command.
+func NewKeysCommand() *cli.Command {
+	return &cli.Command{
+		Name:        "keys",
+		Usage:       "(internal) Should only be called by SSH server",
+		Hidden:      true, // internal commands shouldn't be visible
+		Description: "Queries the Gitea database to get the authorized command for a given ssh key fingerprint",
+		Before:      PrepareConsoleLoggerLevel(log.FATAL),
+		Action:      runKeys,
+		Flags: []cli.Flag{
+			&cli.StringFlag{
+				Name:    "expected",
+				Aliases: []string{"e"},
+				Value:   "git",
+				Usage:   "Expected user for whom provide key commands",
+			},
+			&cli.StringFlag{
+				Name:    "username",
+				Aliases: []string{"u"},
+				Value:   "",
+				Usage:   "Username trying to log in by SSH",
+			},
+			&cli.StringFlag{
+				Name:    "type",
+				Aliases: []string{"t"},
+				Value:   "",
+				Usage:   "Type of the SSH key provided to the SSH Server (requires content to be provided too)",
+			},
+			&cli.StringFlag{
+				Name:    "content",
+				Aliases: []string{"k"},
+				Value:   "",
+				Usage:   "Base64 encoded content of the SSH key provided to the SSH Server (requires type to be provided too)",
+			},
 		},
-		&cli.StringFlag{
-			Name:    "username",
-			Aliases: []string{"u"},
-			Value:   "",
-			Usage:   "Username trying to log in by SSH",
-		},
-		&cli.StringFlag{
-			Name:    "type",
-			Aliases: []string{"t"},
-			Value:   "",
-			Usage:   "Type of the SSH key provided to the SSH Server (requires content to be provided too)",
-		},
-		&cli.StringFlag{
-			Name:    "content",
-			Aliases: []string{"k"},
-			Value:   "",
-			Usage:   "Base64 encoded content of the SSH key provided to the SSH Server (requires type to be provided too)",
-		},
-	},
+	}
 }
 
 func runKeys(ctx context.Context, c *cli.Command) error {