Put in something like `/etc/apt/sources.list.d/stbuehler-openconnect.sources`:

```
Types: deb
URIs: https://download.opensuse.org/repositories/home:/stbuehler:/openconnect/xUbuntu_24.04
Suites: /
Signed-By:
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Version: GnuPG v1.4.5 (GNU/Linux)
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SXFpvX2CrQcGXzElk3LQYL17fZDDp5106tK/b3D8iOV9Ok0qAob98IbSYvQOFNWd
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P9EF1GDKmaLS
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-----END PGP PUBLIC KEY BLOCK-----
```