support multi-pipeline with cli exec

[anbraten]

Clear and concise description of the problem

There currently is no support for woodpecker-cli to run multiple pipeline files as the agent is able to do.

Suggested solution

Running woodpecker-cli exec ./.woodpecker/ should detect that the path is a folder and run all pipelines as the agent would do.
Somehow similar to how woodpecker-cli lint works.

Alternative

No response

Additional context

No response

Validations

• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[Bubu]

Would it be possible to (optionally) just run a single pipeline? I.e. I would for example like to run just woodpecker-cli exec lint.

[6543]

nice idear ...

[anbraten]

I would do it by checking the file/dir type as we do it with lint. For folders run all files and if you call it with a single file just run that file.

        file := c.Args().First()
	if file == "" {
		file = ".woodpecker.yml"
	}

	fi, err := os.Stat(file)
	if err != nil {
		return err
	}
	if !fi.IsDir() {
		return lintFile(file)
	}