check if double-build is still necessary for Linux

[conradkleinespel]

The current Rooster installers build the code both in release and debug modes, because there used to be a bug in the clipboard library on Linux. This bug has been resolved. So as to speed up install times, we shall build only in release mode.

Tasks:

• clone the Git repository for Rooster: git clone https://github.com/conradkdotcom/rooster.git
• build and run Rooster in release mode (ie cargo build --release)
• add a password: ROOSTER_FILE=/tmp/test.rooster rooster add test test
• retrieve the password: rooster get test
• paste the password somewhere to see if the clipboard copy works as expected
• if clipboard works, replace debug binary with the release binary (see the way we do for the rooster binary)
• add yourself to the contributors' list in README.md in alphabetical order

If you have any questions, just let us know and we'll jump in to help.

[conradkleinespel]

done