ifconfig alias loopback on macOS startup

com.foobar.ifconfiglo.plist

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

    <key>ProgramArguments</key>
    <array>
        <string>/sbin/ifconfig</string>
        <string>lo0</string>
        <string>alias</string>
        <string>10.1.1.1/24</string>
    </array>

    <key>StandardOutPath</key>
    <string>/tmp/ifconfiglo.log</string>
    <key>StandardErrorPath</key>
    <string>/tmp/ifconfiglo-error.log</string>

    <key>Debug</key>
    <true />

    <key>KeepAlive</key>
    <true/>
</dict>
</plist>