fix(e2e): Pass GITHUB_ACTION_URL to Docker E2E test runs

[khvn26]

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Changes

This makes sure GITHUB_ACTION_URL is passed during dockerised E2E runs, making the workflow run log available in the Slack reports.

How did you test this code?

Added a purposefully failing test to test the change in CI.

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[github-actions]

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[github-actions]

flagsmith-api image build and security scan finished ✨

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[github-actions]

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[github-actions]

flagsmith-private-cloud image build and security scan finished ✨

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[github-actions]

flagsmith image build and security scan finished ✨

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[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.61%. Comparing base (e7252cb) to head (e625365).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4322   +/-   ##
=======================================
  Coverage   96.61%   96.61%           
=======================================
  Files        1196     1196           
  Lines       39123    39123           
=======================================
  Hits        37797    37797           
  Misses       1326     1326           

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