This started happening today. See: https://git.drupalcode.org/issue/gitlab_templates-3426311/-/jobs/8184842...
$ apt-get update && apt-get install -y shellcheck
Get:1 http://deb.debian.org/debian bookworm InRelease [151 kB]
Get:2 http://deb.debian.org/debian bookworm-updates InRelease [55.4 kB]
Get:3 http://deb.debian.org/debian-security bookworm-security InRelease [48.0 kB]
Get:4 http://deb.debian.org/debian bookworm/main amd64 Packages [8792 kB]
Get:5 https://dl.yarnpkg.com/debian stable InRelease
Get:6 https://deb.nodesource.com/node_20.x nodistro InRelease [12.1 kB]
Get:7 http://deb.debian.org/debian bookworm-updates/main amd64 Packages [6924 B]
Get:8 http://deb.debian.org/debian-security bookworm-security/main amd64 Packages [292 kB]
Err:5 https://dl.yarnpkg.com/debian stable InRelease
The following signatures were invalid: EXPKEYSIG 23E7166788B63E1E Yarn Packaging <yarn@dan.cx>
Get:9 https://deb.nodesource.com/node_20.x nodistro/main amd64 Packages [13.6 kB]
Reading package lists...
W: GPG error: https://dl.yarnpkg.com/debian stable InRelease: The following signatures were invalid: EXPKEYSIG 23E7166788B63E1E Yarn Packaging <yarn@dan.cx>
E: The repository 'https://dl.yarnpkg.com/debian stable InRelease' is not signed.
Same passing job from 2 days ago: https://git.drupalcode.org/project/gitlab_templates/-/jobs/8152064
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