Add pre commit improve tox setup

{{cookiecutter.project_slug}}/.gitlab-ci.yml

@@ -96,15 +96,15 @@ package_files:
     - dind
   variables:
     DOCKER_TLS_CERTDIR: "/certs"
-    DOCKER_TLS_VERIFY: 1
   artifacts:
     expire_in: 1w
     paths:
       - dist/*
   script:
-    - env
+    - unset DOCKER_TLS_VERIFY
+    - env | grep DOCKER
     - source scripts/setup-docker-host.sh
-    - env
+    - env | grep DOCKER
     - tox -e build-ci-linux
 
 package_docs: