Add workflow that fails when Dependabot updates error

[horgh]

Add a weekly scheduled workflow that fails when any "Dependabot Updates" run concluded with failure, startup_failure, or timed_out in the last 8 days, so a silently-broken Dependabot ecosystem surfaces as a red scheduled run that emails a human instead of only a red triangle in the Dependabot tab that nobody checks.

This is a copy of the reference change in maxmind/device-android#61, adjusted to run on Wednesdays and to also treat timed_out as a failure.

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• .github/workflows/dependabot-failure-watcher.yml

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Pull request overview

Adds a scheduled GitHub Actions workflow intended to surface silently failing Dependabot update runs by failing a weekly “watcher” job when recent “Dependabot Updates” workflow runs have concluded unsuccessfully.

Changes:

• Introduces a weekly scheduled workflow (Wednesday) plus manual trigger to check recent “Dependabot Updates” runs.
• Uses gh run list + jq to detect runs concluded with failure, startup_failure, or timed_out within the last 8 days.
• Fails the scheduled job and emits an Actions error annotation listing failing runs and URLs.

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