Same here, in my team we had immediate dependencies defined in setup.cfg when PR was merged, a pip-compile was run and generated requirements.txt and store it i

Same here, in my team we had immediate dependencies defined in setup.cfg when PR was merged, a pip-compile was run and generated requirements.txt and store it in central database (in our case it was consul because that was easiest to get without involving ops). pip-sync was then called to install it in given environment, any promotion from devint -> qa -> staging -> prod, was just copying the requirements.txt from environment earlier and calling pip-sync.