Scala-cli .deb file is not signed

[DavidGoodenough]

Version(s)
All versions

Describe the bug
On a Debian sid system, APT is getting increasingly insistent that.deb files loaded from repositories should be signed. Scala-cli is not and should be.

To Reproduce
If you use Debian sid with an up to date apt , if you run apt update then it will emark that the repository does not have a signed by value, especially if you have used the apt modernize-sources command to use the new sources file format.

Expected behaviour
A distribution key pair should be generated and the .deb should be signed with the private ket and the public key should be made available for download and use in the signed by clause.

[DavidGoodenough]

To complete the upgrade to the scala-cli.deb file, there needs to be a changelog available when an upgrade happens. There is I think a git command which generates this from the git change history.