source: /usr/bin/env: cannot execute binary file

.travis.yml

@@ -57,13 +57,13 @@ deploy:
     edge: true
     # pass environment variables to the container without exposing them in the logs
     script: |
-      env | sed 's/^/export /g' > env && \
+      env | sed 's/^/export /g' > env.source && \
       docker run --rm \
       -v "$(pwd):/io" \
       -w /io \
       --entrypoint bash \
       library/python \
-      -c "source env && pip install twine && twine check wheelhouse/* && twine upload wheelhouse/*"
+      -c "source env.source && pip install twine && twine check wheelhouse/* && twine upload wheelhouse/*"
     on:
       all_branches: true
       condition: $TRAVIS_TAG && $TWINE_USERNAME && $TWINE_PASSWORD