feat(gitpod-cli): add tasks cmd

[andreafalzetti]

Description

Adds a command with 2 sub-commands to gitpod-cli.

• gp tasks list
• gp tasks attach

Related Issue(s)

Fixes #7016

How to test

1. Create a new workspace of gitpod-io/gitpod
2. Go to ./components/gitpod-cli
3. Run go get
4. Run go build
5. List the workspace tasks ./gitpod-cli tasks list
6. Attach to another terminal ./gitpod-cli tasks attach (See the prompt)
7. Try attaching to a specific task by specifing the terminal ID ./gitpod-cli tasks attach <terminalId>

Release Notes

Added a new root cmd to Gitpod CLI. The tasks cmd allows listing tasks and attaching to them.

Documentation

https://github.com/gitpod-io/website/issues/1791

[andreafalzetti]

This is the same as

gitpod/components/supervisor/cmd/terminal-attach.go

Line 79 in 5934558

func attachToTerminal(ctx context.Context, client api.TerminalServiceClient, alias string, opts attachToTerminalOpts) {

We agreed with @akosyakov to duplicate the logic instead of trying to share it between the two CLIs.

[andreafalzetti]

Also, this function comes with a problem - if a terminal attaches to itself, it will go into a loop. In tasks cmd, we try avoiding going into that situation but it's not easy to detect.

[felladrin]

Maybe, in the context of the running terminal, there could be an environment variable indicating it's a Task Terminal, so the attach command could check this env variable, and if detected someone trying run gp tasks attach on it, it would just print a message saying, for example: "It's not possible to attach to a task terminal from another task terminal. Please start a new terminal and run 'gp tasks attach' from there."

[andreafalzetti]

/werft run

👍 started the job as gitpod-build-af-feat-gp-cli-tasks-cmd.3

[felladrin]

I've checked and tested it, and it looks great!

I think this could even be used in #8338