Add sudo -E flag

Author: schlessera

.circleci/config.yml

@@ -15,10 +15,10 @@ jobs:
     steps:
     - checkout
     - run: |
-        sudo sh -c "printf '\ndeb http://ftp.us.debian.org/debian sid main\n' >> /etc/apt/sources.list"
-        sudo apt-get update
-        sudo docker-php-ext-install mysqli
-        sudo apt-get install -y mysql-client-5.7
+        sudo -E sh -c "printf '\ndeb http://ftp.us.debian.org/debian sid main\n' >> /etc/apt/sources.list"
+        sudo -E apt-get update
+        sudo -E docker-php-ext-install mysqli
+        sudo -E apt-get install -y mysql-client-5.7
     - run: |
         echo -e "memory_limit = 1024M" | sudo tee /usr/local/etc/php/php.ini > /dev/null
     - run: |