Jeremy Stanley 33c8b1ac4b Retry acme.sh cloning
Sometimes we observe failures to clone acme.sh from GitHub. Retry it
up to three times with a two-second delay between each try, in hopes
of failing these jobs less often.

While we're here, update the URL to a more current one which doesn't
need redirecting.

Change-Id: I5179c0482afcb407b7d28d4c3ce73d96d41c6493
2021-10-13 18:31:46 +00:00
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