Currently the report fails with variables[Build.SourceBranchName]:
command not found which is obviously not what we want (it’s mixing up
the syntax in Azure’s yaml config and Bash). Looking at the
code in the tell-slack-failed.yml, this one does seem to work but I
haven’t tested this so :crossed-fingers:.
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Currently the message to Slack is always triggered by running the daily
checks. This means that it gets very noisy to:
1. Run the check on PRs affecting the check (like this one),
2. Rerun the check multiple times to ascertain that a given failure is
flaky.
With this PR, the message to Slack is replaced with a simple `echo` when
these checks are not run from the `master` branch, so whoever (manually)
triggered them can still get feedback on the result, but other people
don't get spurious `@here` mentions.
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