Cypress run fails

When trying to run cypress with dotrun in https://github.com/canonical/vanilla-framework/pull/4540 the following error occurs:

```

Your system is missing the dependency: Xvfb

Install Xvfb and run Cypress again.

Read our documentation on dependencies for more information:

https://on.cypress.io/required-dependencies

If you are using Docker, we provide containers with all required dependencies installed.

----------

Error: spawn Xvfb ENOENT

----------

Platform: linux-arm64 (Ubuntu - 20.04)
Cypress Version: 10.6.0
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

= `yarn run cypress:run` errored =
```

Cypress has an official docker image which might be helpful in resolving this issue: https://docs.cypress.io/guides/continuous-integration/introduction#Official-Cypress-Docker-Images