add CLI command to register runner tokens (#23762)

This is a CLI command to generate new tokens for the runners to register
with

Fix https://github.com/go-gitea/gitea/issues/23643

---------

Co-authored-by: delvh <dev.lh@web.de>

cmd/actions.go

@@ -0,0 +1,56 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package cmd
+
+import (
+	"fmt"
+
+	"code.gitea.io/gitea/modules/private"
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/urfave/cli"
+)
+
+var (
+	// CmdActions represents the available actions sub-commands.
+	CmdActions = cli.Command{
+		Name:        "actions",
+		Usage:       "",
+		Description: "Commands for managing Gitea Actions",
+		Subcommands: []cli.Command{
+			subcmdActionsGenRunnerToken,
+		},
+	}
+
+	subcmdActionsGenRunnerToken = cli.Command{
+		Name:    "generate-runner-token",
+		Usage:   "Generate a new token for a runner to use to register with the server",
+		Action:  runGenerateActionsRunnerToken,
+		Aliases: []string{"grt"},
+		Flags: []cli.Flag{
+			cli.StringFlag{
+				Name:  "scope, s",
+				Value: "",
+				Usage: "{owner}[/{repo}] - leave empty for a global runner",
+			},
+		},
+	}
+)
+
+func runGenerateActionsRunnerToken(c *cli.Context) error {
+	ctx, cancel := installSignals()
+	defer cancel()
+
+	setting.InitProviderFromExistingFile()
+	setting.LoadCommonSettings()
+
+	scope := c.String("scope")
+
+	respText, extra := private.GenerateActionsRunnerToken(ctx, scope)
+	if extra.HasError() {
+		return handleCliResponseExtra(extra)
+	}
+	_, _ = fmt.Printf("%s\n", respText)
+	return nil
+}