cypress open + docker on remote VM - Unable to open X display. undefined: 0 illegal access

[mayteio]

I'm trying to get the interactive test runner from Docker container -> remote GCP VM (Ubuntu) -> mac host and get the same error, no matter what I try:

[20:0401/014738.060326:ERROR:browser_main_loop.cc(1434)] Unable to open X display.

undefined:0

illegal access

References:

• https://stackoverflow.com/questions/59514234/viewing-the-interactive-cypress-test-runner-in-docker-on-linux
• Error Unable to open X display when running Cypress in docker in Interactive mode  cypress-docker-images#395
• Cypress GUI cypress-docker-images#29
• https://gist.github.com/Yasushi/d4c719aacd79310777293ce024c33bcd

My understanding is that cypress, when running from docker, needs an X11 server to forward requests to. This server runs on my host and cypress connects to it via the DISPLAY env variable. To accept these requests, you have to add the requesting IP to xhost with xhost +$IP where IP is the machine making the request. I've done this.

Next, you need to make sure the DISPLAY env is set correctly. I have been working from a remote box (Ubuntu), so I have set the DISPLAY env to my host mac's IP with port 0: xxx.xxx.xxx.xxx:0. I have tried passing in the DISPLAY variable both via docker run and docker-compose:

docker run -it --rm \
    --network host \
    -v ~/.Xauthority:/root/.Xauthority:ro \
    -e DISPLAY \
    -v $PWD/e2e:/e2e \
    -w /e2e \
    --entrypoint '' \
    cypress/included:6.8.0 \
    npx cypress open

version: '3'
services:
  e2e:
    image: cypress/included:6.8.0
    network_mode: host
    working_dir: /e2e
    volumes:
      - ./e2e:/e2e
      - ~/.Xauthority:/root/.Xauthority:rw
    entrypoint: cypress open --project /e2e
    environment:
      - DISPLAY

I have verified that DISPLAY is being passed through to the docker image by adding echo $DISPLAY to the entrypoint command - it correctly echo's my host's IP address. No matter what I do, I always get Unable to open X display undefined:0.. I've tried multiple versions of cypress/included`, I have ensured XQuartz is set up with the correct security setting (Allow connections from network clients). At a loss here!