.github: check connectivity of external links via GitHub action (#4135)#4138

Merged

yikeke merged 3 commits intopingcap:release-3.1from ti-srebot:release-3.1-89f7b0796d98

Nov 3, 2020

+42-12

Commits on Nov 3, 2020

cherry pick pingcap#4135 to release-3.1

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resolve
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Update link-check.yaml
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