Add .deb specific dependencies (#1858)
Add .deb specific dependencies (#1858)

Some barebones debian-based systems (e.g. Docker containers) don't come with the libasound2 and libxss1 libraries, which electron-builder does not include by default.
nrizzio/Signal-Desktop,nrizzio/Signal-Desktop,nrizzio/Signal-Desktop,nrizzio/Signal-Desktop