.github: check connectivity of external links via GitHub action (#4135) #4137
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cherry-pick #4135 to release-3.0
What is changed, added or deleted? (Required)
A migration from pingcap/docs-dm#353
Note this external link check isn't required to pass, in order to prevent false alarms from blocking PR merge.
The current regex exclusions is:
http://172.*|https://github.com/.*/pull/.*|https://github.com/.*/issues/.*|https://github.com/[^.\n]*$|http://127.0.0.1.*|http://localhost.*|http://.*:.*|https://static.googleusercontent.com/media/research.google.com/.*|.*.md
Meaning the check will skip checking the URLs matching the above patterns.
Which TiDB version(s) do your changes apply to? (Required)
What is the related PR or file link(s)?
Do your changes match any of the following descriptions?