launchctl load -w /Library/LaunchDaemons/com.docker.system-prune.plist

com.docker.system-prune.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.docker.system-prune</string>
        <key>Program</key>
        <string>/usr/local/bin/docker</string>
        <key>ProgramArguments</key>
        <array>
            <string>system</string>
            <string>prune</string>
            <string>-f</string>
        </array>
        <key>RunAtLoad</key>
        <true/>
        <key>StartCalendarInterval</key>
        <dict>
            <key>Hour</key>
            <integer>1</integer>
            <key>Minute</key>
            <integer>0</integer>
        </dict>
    </dict>
</plist>