Add PIP_NO_BINARY to passenv in tox.ini

Author: AlexCernik

tox.ini

@@ -23,6 +23,7 @@ setenv =
   postgres: DATABASE_URL=postgres://postgres:postgres@localhost:5432/postgres
 passenv =
   GENTESTCSR
+  PIP_NO_BINARY
 
 # Hint: quickly run a one-shot container with:
 #   docker run --rm -e POSTGRES_PASSWORD=postgres -p 5432:5432 -it postgres:alpine