debian: Ship database signing key.

This key is needed to download and verify the database.

Fixes #12410.
Signed-off-by: Stefan Schantl <stefan.schantl@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

debian/libloc.install

@@ -6,3 +6,4 @@ usr/lib/python3*/dist-packages
 usr/lib/python3*/lib-dynload/*.so
 src/systemd/*.service		/lib/systemd/system/
 src/systemd/*.timer		/lib/systemd/system/
+var/lib/location/signing-key.pem