* Move flaky test report from PR comment to Mattermost channel
Replace the github-script step that posted the flaky test summary as a PR
comment with a step that posts the summary to a Mattermost channel via a new
Mattermost incoming webhook (WEBHOOK_URL_FLAKY_TEST_MM). The HTML <table>
summary is converted to a Markdown table, with content pipes escaped and HTML
entities decoded. The existing custom flaky-test hub webhook is left untouched.
Co-authored-by: Maria A Nunez <maria.nunez@mattermost.com>
* Hoist github.server_url into SERVER_URL env var
Keep all GitHub Actions context expressions in the step's env block for
consistency, and build PR_URL purely from shell variables.
Co-authored-by: Maria A Nunez <maria.nunez@mattermost.com>
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Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Maria A NunezandCursor Agent
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