Set up CI job to run integration tests

MR: ci: Run Web IDE integration tests on GitLab CI (!496 - merged)

Description

Run playwright integration tests in the Web IDE's CI pipeline.

Acceptance criteria

• Build an image based on Playwright docker's image https://playwright.dev/docs/docker. The docker image should also provide:
  • dnsmasq to set up a wildcard domain for the local HTTPS server.
  • mkcert to generate TLS certificates for the local HTTPS server.
• Set up a GitLab Ci job that builds the docker image only when the Dockerfile changes and pushes it to the project's container registry.
• Consider using CI_JOB_TOKEN to authenticate API requests or request a gitlab.com access token from the QA team.
• Set up environment variables required by playwright.
• Set up a GitLab CI job that runs the integration tests on feature branches and main.

Implementation notes

• The token should not be saved to logs as an artifact when logging into the web-ide.