upstream 1.3.8 + d/copyright, enable CI

Rebecca N. Palmerrequested to merge
rnpalmer-guest/bottleneck:master into master

Sorry for duplicated work; you probably don't want to literally merge this, but you may still want the salsa-ci.yml and d/copyright update.

(The red CI status is Lintian pointing out that I'm not the maintainer of this.)

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