Include license files in apt package

[pabl0]

Bug Description

The Debian package does not follow normal Debian conventions with licensing information.

I can find two files under /opt/Signal: LICENSE.electron.txt and LICENSES.chromium.html.

However, the license file for Signal itself (GPL-3.0 presumably) is not included. Also, apparently Signal ships with at least two embedded libraries (libffmpeg.so and libnode.so), for which no licensing information is provided in the package. (I believe they are not part of "electron" or "chromium", but separate libraries?)

Steps to Reproduce

1. apt install signal-desktop
2. less /usr/share/doc/signal-desktop/copyright

Actual Result:

No such file or directory

Expected Result:

Copyright and licensing information about all software shipped with the package.

Debian Policy 12.5, Copyright Information

Platform Info

Signal Version:

1.21.0

Operating System:

Debian 9.7.

[stale]

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