Added login page for sso compliance

[samhotep]

Done

• Added an explicit login page to comply with login.ubuntu.com SSO configuration.

Logging in with SSO is inconsistent on staging and production due to CORS headers being modified or stripped by the content-cache during the redirect to login.ubuntu.com. With this page, the redirect is triggered by the user hence avoiding needing CORS.

QA

• Open the demo. If not logged in, you should be directed to /login_page. Clicking the log in button should trigger the sso flow, and redirect you to the dashboard.
• Logging out should redirect you to /login_page

[webteam-app]

Demo

Jenkins

demos.haus

[petesfrench]

• I logged in and was redirected to the landing page
• I clicked the log out button and was redirected to the login page (all good so far)
• I then removed /login_page from the URl and loaded the page and it went to the landing page

Expected behaviour:

• to be redirected to the login page, as I should be logged out

[samhotep]

Great catch! It seems to be a stale browser session @petesfrench, lemme see if there's a quick way we can clear it from within the app

[petesfrench]

LGTM

[github-actions]

🎉 This PR is included in version 1.0.0 🎉

The release is available on GitHub release

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