Use more standard debian tools for github package build.

Also use eatmydata a bit more to speed up build.

.github/workflows/ci.yml

@@ -71,9 +71,10 @@ jobs:
         git fetch --recurse-submodules=no https://github.com/linuxcnc/linuxcnc refs/tags/*:refs/tags/*
         ./scripts/travis-install-build-deps.sh
         sudo apt-get install -y eatmydata
-        codename=$(grep VERSION_CODENAME /etc/os-release | cut -d = -f 2)
+        codename=$(lsb_release -cs)
         dch --maintmaint --distribution $codename "GitHub test package."
-        fakeroot ./debian/rules binary
+        eatmydata debian/configure
+        eatmydata debuild
         sudo apt-get install ../*.deb
         eatmydata ./scripts/runtests -p tests/
         eatmydata lintian --info --display-info --pedantic --display-experimental ../*.deb