feat(sshbox): add sshbox to run commands

[mudler]

This PR adds a specific service "sshbox" that is connected directly to LocalAGI. It is a container running sshd which is set with root/root as default. This can be changed easily by configuring the docker-compose file and tweaking the environment variables as needed.

When LOCALAGI_SSHBOX_URL is set, the ssh action can be picked up without configuration and will give agents automatically access to the sshbox.

[Copilot]

Pull Request Overview

This PR integrates a new service ("sshbox") to allow command execution via an SSH box when LOCALAGI_SSHBOX_URL is provided. Key changes include:

• Modifying the ShellAction to accept a new sshBoxURL parameter and an optional password.
• Adjusting the Run method and definition condition to accommodate sshbox usage.
• Adding configuration constants, environment variables, a new Dockerfile, and a GitHub Actions job for building the sshbox image.

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
services/actions/shell.go	Updated ShellAction to support sshbox, added parsing for sshBoxURL and handling of an optional password, and switched the action name to "run_command".
services/actions.go	Introduced constant for sshbox URL and updated the Shell action construction.
main.go	Added new environment variable assignment for sshBoxURL.
docker-compose.yaml	Added sshbox service with SSH configuration and environment variable.
README.md	Updated documentation to include sshbox configuration instructions.
Dockerfile.sshbox	New Dockerfile to build the sshbox container.
.github/workflows/image.yml	Added a GitHub Actions job for building the sshbox docker image.

Comments suppressed due to low confidence (1)

services/actions/shell.go:171

• Avoid using log.Fatalf in library code as it abruptly terminates the application; consider returning an error instead to enable graceful error handling.

key, err := ssh.ParsePrivateKey([]byte(privateKey))

[Copilot]

Consider validating the format of sshBoxURL (e.g. ensuring it conforms to the expected 'user' or 'user:password@host' pattern) before parsing it, to avoid potential runtime errors.

Suggested change

	// sshbox url can be root:root@localhost:2222
	// Validate sshBoxURL format (e.g., user or user:password@host)
	sshBoxPattern := `^([^:@]+)(:[^:@]+)?@([^:@]+)$`
	matched, err := regexp.MatchString(sshBoxPattern, a.sshBoxURL)
	if err != nil || !matched {
	log.Printf("Invalid sshBoxURL format: %s", a.sshBoxURL)
	return types.ActionResult{}, fmt.Errorf("invalid sshBoxURL format")
	}
	// Parse sshBoxURL