Remove tarball target.

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
Add propagatedUserEnvPkgs and try to run ert tests.

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
Fix Emacs' site-start file.

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
Merge remote-tracking branch 'origin/emacs-package-el' into emacs-packages-updates
Update emacs-packages-generated.nix.