add service managment into sketchybar like yabai

[k2662]

It would be nice to have sketchybar manage itself instead of buggy brew.

[FelixKratz]

It is true that brew is a bit buggy and there are so many bug reports just because of strangeness in brew, however it seems to work great most of the times. It is very simple to work directly with the launchctl cli to manage the service completely without relying on brew or sketchybar:

1. Compile the sketchybar program from source and copy it to /usr/local/bin/sketchybar
2. Create a git.felix.sketchybar.plist file in ~/Library/LaunchAgents/

   <?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>git.felix.sketchybar</string>
   <key>ProgramArguments</key>
   <array>
       <string>/usr/local/bin/sketchybar</string>
   </array>
   <key>EnvironmentVariables</key>
   <dict>
       <key>PATH</key>
       <string>/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/opt/homebrew/bin:/opt/homebrew/sbin</string>
   </dict>
   <key>RunAtLoad</key>
   <true/>
   <key>KeepAlive</key>
   <true/>
   <key>StandardOutPath</key>
   <string>/tmp/sketchybar.out.log</string>
   <key>StandardErrorPath</key>
   <string>/tmp/sketchybar.err.log</string>
   <key>ThrottleInterval</key>
   <integer>30</integer>
   <key>ProcessType</key>
   <string>Interactive</string>
   <key>Nice</key>
   <integer>-20</integer>
   </dict>
   </plist>

3. Bootstrap the plist with

   launchctl bootstrap gui/$UID $HOME/Library/LaunchAgents/git.felix.sketchybar.plist
   launchctl load -w $HOME/Library/LaunchAgents/git.felix.sketchybar.plist