Add LaunchAgents directory creation (#125)

Create directory for bootstrap configuration file.

Author: burningtnt

build/macos/scripts/postinstall

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+mkdir -p /Library/LaunchAgents/
+
 cat <<EOF > /Library/LaunchAgents/net.burningtnt.terracotta.daemon.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">