Launchpad daily builds use a "recipe" to create daily PPA updates

>>> recipe from launchpad
# git-build-recipe format 0.4 deb-version {debupstream}~{time}
lp:~freecad-maintainers/freecad/+git/freecad master
nest-part debian lp:freecad debian debian ppa/daily-impish
#nest-part SHORT-NAME URL SOURCE-DIRECTORY [TARGET-DIRECTORY [REVISION]]

>>> recipe for local repos
>>> "FreeCAD" is clone of Launchpad FC repo
>>> "Launchpad" is clone of Launchpad salsa repo
# git-build-recipe format 0.4 deb-version {debupstream}~{time}
./FreeCAD master
nest-part debian ./Launchpad debian debian ppa/daily-impish

>>> make a recipe
git-build-recipe --allow-fallback-to-native freecad-recipe work
git-build-recipe --allow-fallback-to-native local.recipe work
>>> results in unpacked source dir + tar.xz and dsc files in ./work/$myRecipeName/
>>> unpacked dir has control and rules files for debuild
>>> regular cmake, make build generates a good executable
>>> debuild and dpkg generates executables with problems 
>>> easiest check is if TechDraw Vertex and LineWidth behave properly

>>> cd to unpacked source dir
cd work/$myRecipeName/
debuild -i -us -uc -b
>>> makes a bunch of packages in work

>>> install in dependency order
dpkg -i package-name

==========================================

https://code.launchpad.net/~freecad-maintainers/freecad/+git/freecad-salsa
https://code.launchpad.net/+code/~freecad-maintainers/freecad/+git/freecad

http://ppa.launchpad.net/canonical-is-sa/buildd/ubuntu focal main
http://ppa.launchpad.net/canonical-is-sa/buildd/ubuntu impish main

freecad-daily_0.20~pre1~202205141344.tar.xz
freecad-daily_0.20~pre1~202205141344.dsc

dpkg-source --extract freecad-daily_0.20~pre1~202205141344.dsc
>>> builds source tree

debuild -i -us -uc -b

>>> didn't work
sudo apt install ./freecad-daily_0.20~pre1~202205141344_all.deb

>>> this one works
sudo dpkg -i package_file.deb

>>> didn't work
sudo apt-get install -f