CI: pass on the BASE_URL 🤦🤦‍♀️

Author: bsipocz

tox.ini

@@ -11,7 +11,7 @@ description = run tests
 setenv =
     devdeps: PIP_EXTRA_INDEX_URL =  https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
 
-passenv = OMP_NUM_THREADS
+passenv = BASE_URL, OMP_NUM_THREADS
 
 deps =
     # We use these files to specify all the dependencies, and below we override