launchctl to set a loopback for Docker xdebug

com.newcity.docker_loopback.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>com.newcity.docker_loopback.plist</string>

    <key>OnDemand</key>
    <false/>

    <key>LaunchOnlyOnce</key>
    <true/>

    <key>UserName</key>
    <string>root</string>

    <key>GroupName</key>
    <string>wheel</string>

    <key>ProgramArguments</key>
    <array>
            <string>/sbin/ifconfig</string>
            <string>lo0</string>
            <string>alias</string>
            <string>10.254.254.254</string>
    </array>
</dict>
</plist>

Create in /Library/LaunchAgents, then

sudo launchctl load /Library/LaunchAgents/com.newcity.docker_loopback.plist