In #7386 I inadvertently removed the default value for the argument
`check-changelog.sh` takes. This did not break CI because CI always
passes the argument explicitly, but it did break local workflows for
some developers.
Apologies.
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Currently, when Dependabot makes a PR, not only do we need to manually
trigger CI through `/azp run`, we also need to either change the commit
or add a new one to pass the changelog check. This addresses that second
part by making a exception for PRs signed by dependabot.
This is also a bit of an excuse to play with git signatures and gpg.
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This commit aims at enabling future patch releases; it is the
master-branch equivalent of #5569 (applied to the 1.0 release branch).
The only change between the two changelogs should be that this one also
changes the docs cron so it can find the trigger commits for patch
releases.
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