[test] experimental inner loop with isolation network and process tree

[iQQBot]

Description

this PR is an experimental inner loop with an isolation network and process tree and special root filesystem, this PR focus on custom docker image

Related Issue(s)

Fixes #

How to test

1. start a workspace in this preview environment
2. create a Dockerfile in this workspace
3. use following command to export docker filesystem to /.debug/rootfs folder

sudo rm -rf /.debug/rootfs \
  && sudo mkdir -p /.debug/rootfs \
  && sudo chown -R gitpod:gitpod /.debug/rootfs \
  && DOCKER_BUILDKIT=1 docker build -t inner-loop . \
  && docker rm -f inner-loop-0 &>/dev/null \
  && docker run --name inner-loop-0 inner-loop \
  && echo "exporting filesystem, may take sometimes..." \
  && docker export inner-loop-0 | sudo tar xf - -C /.debug/rootfs

4. use /.supervisor/supervisor inner-loop to build a new process tree with new root filesystem
5. once you saw Web UI available at http://localhost:23000 it means IDE is ready, you add prefix debug- in your workspace URL, to access debug wokspace.
6. exec curl lams.sh | sh in debug workspace, you will see a notification, click open in browser, you can view this port in debug workspace. (url prefix {port}-debug-{workspaceId} )
7. you can press Control + C to stop debug workspace.

Release Notes

NONE

Documentation

Werft options:

• /werft with-local-preview
  If enabled this will build install/preview
• /werft with-preview
• /werft with-large-vm
• /werft with-integration-tests=all
  Valid options are all, workspace, webapp, ide, jetbrains, vscode, ssh

[werft-gitpod-dev-com]

started the job as gitpod-build-pd-pd-wskit-2.7 because the annotations in the pull request description changed
(with .werft/ from main)

[akosyakov]

/werft run

👍 started the job as gitpod-build-pd-pd-wskit-2.30
(with .werft/ from main)

[akosyakov]

/werft run recreate-vm=true

👍 started the job as gitpod-build-pd-pd-wskit-2.31
(with .werft/ from main)

[akosyakov]

/werft run with-clean-slate-deployment=true

👍 started the job as gitpod-build-pd-pd-wskit-2.32
(with .werft/ from main)

[akosyakov]

I'm going to close it, since we decided to go with docker run approach. I've extracted proxy bits in #15910 and #15795. I will add @iQQBot as a co-author 🙏 Thank you a lot!