Gitpod.io online IDE integration

[freiondrej-economia]

Hello,
I recently stumbled upon an amazing project gitpod.io, which creates ephemeral workflows with a web IDE, think ready-to-code setups.
I have no experience with it, so proper integration with Rector should be proposed by someone who knows Gitpod, but this is a minimal setup I used to get rector working:

/.gitpod.yml

# List the start up tasks. Learn more https://www.gitpod.io/docs/config-start-tasks/
tasks:
   - init: composer install # runs during prebuild
      command: echo 'composer install'
image:
   file: .gitpod.Dockerfile

/.gitpod.Dockerfile

FROM php:8.0-fpm-buster

RUN apt-get update && apt-get install -y \
	# for composer
	zip \
	unzip \
	# git
	git \
	&& rm -rf /var/lib/apt/lists/*

COPY --from=composer:2 /usr/bin/composer /usr/bin/composer

I used it to create a bugfix PR for Rector-src, but the process could be even smoother with some guidelines.
This is what I did:

1. I forked rectorphp/rector-src on Github
2. I used gitpod magic url (gitpod.io/#) to spin up the workspace
3. gitpod used the .gitpod.yml file (which I had to add to my forked repo, but Rector could have it there already) to start a php8 container, where I could run tests and develop the feature.
4. I pushed my branch to Github using Gitpod commandline
5. I created the PR through Github

I think encouraging developers to use this could really lower the barrier to contributing, because they practically just need to open a new browser tab and Gitpod prepares everything for them.
WDYT? Would it be good to have .gitpod.yml already in rector, so that new contributors could start coding right away?

[freiondrej-lmc]

We could probably start with minimal docker setup from rectorphp/rector-src#998

[freiondrej-lmc]

Probably Github codespaces would be even easier to set up.