Fix env in travis config

Author: th-ch

.travis.yml

@@ -22,7 +22,11 @@ script:
   - |
     if [ "$TRAVIS_OS_NAME" == "linux" ]; then
       docker run --rm \
-        --env-file <(env | grep -iE 'DEBUG|NODE_|ELECTRON_|YARN_|NPM_|CI|CIRCLE|TRAVIS|APPVEYOR_|CSC_|_TOKEN|_KEY|AWS_|STRIP|BUILD_') \
+        $(env | \
+          grep -Eo '^[^\s=]*(DEBUG|NODE_|ELECTRON_|YARN_|NPM_|CI|CIRCLE|TRAVIS|APPVEYOR_|CSC_|_TOKEN|_KEY|AWS_|STRIP|BUILD_)[^\s=]*' | \
+          sed '/^$/d;s/^/-e /' | \
+          paste -sd ' ' \
+        ) \
         -v ${PWD}:/project \
         -v ~/.cache/electron:/root/.cache/electron \
         -v ~/.cache/electron-builder:/root/.cache/electron-builder \