E2E: Add facebook OAuth login spec

What does this MR do and why?

Adds E2E test for OAuth login with Facebook

Related to gitlab-org/quality/testcases#3979 (closed)

Depends on gitlab-qa!1207 (merged)

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Before	After

How to set up and validate locally

Step 1

We will need to run GitLab with TLS enabled in docker exposed at https://gitlab.test. This will require some certificates be placed in the /etc/gitlab folder on the docker container. To do this:

1. Copy the files in gitlab-qa/tls_certificates/gitlab to a gitlab/config/ssl folder on your computer such as ~/srv/gitlab/config/ssl

2. Copy the files in gitlab-qa/tls_certificates/authority to a gitlab/config/trusted-certs folder on your computer such as ~/srv/gitlab/config/trusted-certs

We will mount gitlab/config folder onto /etc/gitlab folder when starting the docker container in step 5.

Step 2

In your /private/etc/hosts file, add this line:

127.0.0.1       gitlab.test

Step 3

Create test network

docker network create test

Step 4

Login to docker and pull the gitlab image:

docker login --username <YOUR_GITLAB_USERNAME> --password "<YOUR_GITLAB_PAT_WITH_REGISTRY_ACCESS>" registry.gitlab.com

docker pull registry.gitlab.com/gitlab-org/build/omnibus-gitlab-mirror/gitlab-ee:9757aba8814d8c02d86ba0a4d496009d9ad16f63

Step 5

Start GitLab in a docker with:

docker run \
--hostname gitlab.test \
--publish 443:443 --publish 80:80 \
--name gitlab-oauth \
--net test \
--platform linux/amd64 \
--volume ~/srv/gitlab/config:/etc/gitlab \
--env GITLAB_OMNIBUS_CONFIG="gitlab_rails['initial_root_password']='5iveL\!fe'; gitlab_rails['omniauth_enabled'] = true; letsencrypt['enable'] = false; external_url 'https://gitlab.test'; gitlab_rails['omniauth_allow_single_sign_on'] = ['facebook']; gitlab_rails['omniauth_block_auto_created_users'] = false; gitlab_rails['omniauth_providers'] = [   {     name: 'facebook',     app_id: '$QA_FACEBOOK_OAUTH_APP_ID',     app_secret: '$QA_FACEBOOK_OAUTH_APP_SECRET',  verify_ssl: false } ]; " \
registry.gitlab.com/gitlab-org/build/omnibus-gitlab-mirror/gitlab-ee:9757aba8814d8c02d86ba0a4d496009d9ad16f63

Step 6

From the qa directory:

bundle install

QA_FACEBOOK_USERNAME="<QA_FACEBOOK_USERNAME>" QA_FACEBOOK_PASSWORD="<QA_FACEBOOK_PASSWORD>" QA_DEBUG=true CHROME_HEADLESS=false bundle exec bin/qa Test::Instance::All https://gitlab.test qa/specs/features/browser_ui/1_manage/login/oauth_login_with_facebook_spec.rb -- --tag orchestrated

All variables are in 1Password GitLab-QA vault with the placeholder names. Make sure to click "Expand Search to All Fields" when searching in 1Password.

MR acceptance checklist

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