[hojjatabdollahi]

The changes in #399 broke just build-release.

Moving the variable to build-vendored fixes the original issue, and doesn't cause regression.

Also added a default APP ID so cargo clippy doesn't fail because of no APP_ID env var.

Also not sure why ci.yml was dropped. But I added it back + clippy and test.

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[jacobgkau]

It looks like debian/rules uses just build-vendored for dpkg-buildpackage builds, which is why we didn't notice just build-release breaking.

Confirmed this fixes just build-release. Our standard builds with dpkg-buildpackage/just build-vendored are still working. The app library still works as expected.