laradock修改国内源

# If you need to change the sources (i.e. to China), set CHANGE_SOURCE to true
CHANGE_SOURCE=true  
# Set CHANGE_SOURCE and UBUNTU_SOURCE option if you want to change the Ubuntu system sources.list file.
UBUNTU_SOURCE=aliyun

### WORKSPACE #############################################

WORKSPACE_INSTALL_NODE=false 
WORKSPACE_NODE_VERSION=node 
WORKSPACE_INSTALL_YARN=false 
WORKSPACE_INSTALL_NPM_GULP=false 
WORKSPACE_INSTALL_NPM_BOWER=false 
WORKSPACE_INSTALL_NPM_VUE_CLI=false 
WORKSPACE_INSTALL_NPM_ANGULAR_CLI=false