chore(upgrade): urfave/cli from v2 to v3 (#8035)

urfave/cli  v2 will eventually become unmaintained, switch over to v3 which is the latest supported version.

Note: the `docs` command would be a lot of work to restore with v3 ([the package is still in alpha](https://github.com/urfave/cli-docs)) An alternative to avoid a breaking change would be to not upgrade from v2 to v3 for that reason alone.
Note: these commits were cherry-picked from https://code.forgejo.org/forgefriends/forgefriends
Note: it is best reviewed side by side with no display of whitespace changes (there are a lot of those when converting vars to func).

- a few functional changes were necessary and are noted in context in the file changes tab
- https://cli.urfave.org/migrate-v2-to-v3/ upgrade instructions were followed in the most minimal way possible
- upgrade gof3 to v3.10.8 which includes and upgrade from urfave/cli  v2 to urfave/cli  v3
- upgrade gitlab.com/gitlab-org/api/client-go v0.129.0 because it is an indirect dependency of gof3 and requires a change because of a deprecated field that otherwise triggers a lint error but nothing else otherwise
- verified that the [script](https://codeberg.org/forgejo/docs/src/branch/next/scripts/cli-docs.sh) that generates the [CLI documentation](https://codeberg.org/forgejo/docs/src/branch/next/scripts/cli-docs.sh) still works. There are cosmetic differences and the **help** subcommand is no longer advertised (although it is still supported) but the `--help` option is advertised as expected so it is fine.
- end-to-end tests [passed](https://code.forgejo.org/forgejo/end-to-end/pulls/667) (they use the Forgejo CLI to some extent)

## Checklist

The [contributor guide](https://forgejo.org/docs/next/contributor/) contains information that will be helpful to first time contributors. There also are a few [conditions for merging Pull Requests in Forgejo repositories](https://codeberg.org/forgejo/governance/src/branch/main/PullRequestsAgreement.md). You are also welcome to join the [Forgejo development chatroom](https://matrix.to/#/#forgejo-development:matrix.org).

### Tests

- I added test coverage for Go changes...
  - [ ] in their respective `*_test.go` for unit tests.
  - [ ] in the `tests/integration` directory if it involves interactions with a live Forgejo server.
- I added test coverage for JavaScript changes...
  - [ ] in `web_src/js/*.test.js` if it can be unit tested.
  - [ ] in `tests/e2e/*.test.e2e.js` if it requires interactions with a live Forgejo server (see also the [developer guide for JavaScript testing](https://codeberg.org/forgejo/forgejo/src/branch/forgejo/tests/e2e/README.md#end-to-end-tests)).

### Documentation

- [ ] I created a pull request [to the documentation](https://codeberg.org/forgejo/docs) to explain to Forgejo users how to use this change.
- [x] I did not document these changes and I do not expect someone else to do it.

### Release notes

- [ ] I do not want this change to show in the release notes.
- [ ] I want the title to show in the release notes with a link to this pull request.
- [x] I want the content of the `release-notes/<pull request number>.md` to be be used for the release notes instead of the title.

<!--start release-notes-assistant-->

## Release notes
<!--URL:https://codeberg.org/forgejo/forgejo-->
- Breaking features
  - [PR](https://codeberg.org/forgejo/forgejo/pulls/8035): <!--number 8035 --><!--line 0 --><!--description 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-->The `forgejo docs` command is deprecated and CLI errors are now displayed on stderr instead of stdout. These breaking changes happened because the package used to parse the command line arguments was [upgraded from v2 to v3](https://cli.urfave.org/migrate-v2-to-v3/). A [separate project was initiated](https://github.com/urfave/cli-docs) to re-implement the `docs` command, but it is not yet production ready.<!--description-->
<!--end release-notes-assistant-->

Co-authored-by: limiting-factor <limiting-factor@posteo.com>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/8035
Reviewed-by: Gusted <gusted@noreply.codeberg.org>

cmd/main_test.go

@@ -4,6 +4,7 @@
 package cmd
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"io"
@@ -17,7 +18,7 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"github.com/urfave/cli/v2"
+	"github.com/urfave/cli/v3"
 )
 
 func TestMain(m *testing.M) {
@@ -28,10 +29,10 @@ func makePathOutput(workPath, customPath, customConf string) string {
 	return fmt.Sprintf("WorkPath=%s\nCustomPath=%s\nCustomConf=%s", workPath, customPath, customConf)
 }
 
-func newTestApp(testCmdAction func(ctx *cli.Context) error) *cli.App {
+func newTestApp(testCmdAction func(_ context.Context, ctx *cli.Command) error) *cli.Command {
 	app := NewMainApp("version", "version-extra")
 	testCmd := &cli.Command{Name: "test-cmd", Action: testCmdAction}
-	prepareSubcommandWithConfig(testCmd, appGlobalFlags())
+	prepareSubcommandWithConfig(testCmd, appGlobalFlags)
 	app.Commands = append(app.Commands, testCmd)
 	app.DefaultCommand = testCmd.Name
 	return app
@@ -43,7 +44,7 @@ type runResult struct {
 	ExitCode int
 }
 
-func runTestApp(app *cli.App, args ...string) (runResult, error) {
+func runTestApp(app *cli.Command, args ...string) (runResult, error) {
 	outBuf := new(strings.Builder)
 	errBuf := new(strings.Builder)
 	app.Writer = outBuf
@@ -66,7 +67,6 @@ func TestCliCmd(t *testing.T) {
 	defaultCustomConf := filepath.Join(defaultCustomPath, "conf/app.ini")
 
 	cli.CommandHelpTemplate = "(command help template)"
-	cli.AppHelpTemplate = "(app help template)"
 	cli.SubcommandHelpTemplate = "(subcommand help template)"
 
 	cases := []struct {
@@ -110,12 +110,17 @@ func TestCliCmd(t *testing.T) {
 		},
 	}
 
-	app := newTestApp(func(ctx *cli.Context) error {
-		_, _ = fmt.Fprint(ctx.App.Writer, makePathOutput(setting.AppWorkPath, setting.CustomPath, setting.CustomConf))
-		return nil
-	})
 	for _, c := range cases {
 		t.Run(c.cmd, func(t *testing.T) {
+			defer test.MockProtect(&setting.AppWorkPath)()
+			defer test.MockProtect(&setting.CustomPath)()
+			defer test.MockProtect(&setting.CustomConf)()
+
+			app := newTestApp(func(_ context.Context, ctx *cli.Command) error {
+				_, _ = fmt.Fprint(ctx.Root().Writer, makePathOutput(setting.AppWorkPath, setting.CustomPath, setting.CustomConf))
+				return nil
+			})
+
 			for k, v := range c.env {
 				t.Setenv(k, v)
 			}
@@ -123,34 +128,34 @@ func TestCliCmd(t *testing.T) {
 			r, err := runTestApp(app, args...)
 			require.NoError(t, err, c.cmd)
 			assert.NotEmpty(t, c.exp, c.cmd)
-			assert.Contains(t, r.Stdout, c.exp, c.cmd)
+			assert.Contains(t, r.Stdout, c.exp, c.cmd+"\n"+r.Stdout)
 		})
 	}
 }
 
 func TestCliCmdError(t *testing.T) {
-	app := newTestApp(func(ctx *cli.Context) error { return errors.New("normal error") })
+	app := newTestApp(func(_ context.Context, ctx *cli.Command) error { return errors.New("normal error") })
 	r, err := runTestApp(app, "./gitea", "test-cmd")
 	require.Error(t, err)
 	assert.Equal(t, 1, r.ExitCode)
 	assert.Empty(t, r.Stdout)
 	assert.Equal(t, "Command error: normal error\n", r.Stderr)
 
-	app = newTestApp(func(ctx *cli.Context) error { return cli.Exit("exit error", 2) })
+	app = newTestApp(func(_ context.Context, ctx *cli.Command) error { return cli.Exit("exit error", 2) })
 	r, err = runTestApp(app, "./gitea", "test-cmd")
 	require.Error(t, err)
 	assert.Equal(t, 2, r.ExitCode)
 	assert.Empty(t, r.Stdout)
 	assert.Equal(t, "exit error\n", r.Stderr)
 
-	app = newTestApp(func(ctx *cli.Context) error { return nil })
+	app = newTestApp(func(_ context.Context, ctx *cli.Command) error { return nil })
 	r, err = runTestApp(app, "./gitea", "test-cmd", "--no-such")
 	require.Error(t, err)
 	assert.Equal(t, 1, r.ExitCode)
-	assert.Equal(t, "Incorrect Usage: flag provided but not defined: -no-such\n\n", r.Stdout)
-	assert.Empty(t, r.Stderr) // the cli package's strange behavior, the error message is not in stderr ....
+	assert.Equal(t, "Incorrect Usage: flag provided but not defined: -no-such\n\n", r.Stderr)
+	assert.Empty(t, r.Stdout)
 
-	app = newTestApp(func(ctx *cli.Context) error { return nil })
+	app = newTestApp(func(_ context.Context, ctx *cli.Command) error { return nil })
 	r, err = runTestApp(app, "./gitea", "test-cmd")
 	require.NoError(t, err)
 	assert.Equal(t, -1, r.ExitCode) // the cli.OsExiter is not called