Add 'Disable Wi-Fi auto-join' macOS script to scripts library (#39813)

## Summary

Adds a new pre-baked script to the
[fleetdm.com/scripts](https://fleetdm.com/scripts) library: **Disable
Wi-Fi auto-join** for macOS.

## Changes

- Added a new entry to `docs/scripts.yml` in the macOS section
- The script disables auto-join for a specified Wi-Fi SSID using
`networksetup` and `PlistBuddy`/`defaults write`
- Based on [Alan Siu's
approach](https://www.alansiu.net/2026/01/22/scripting-disabling-auto-join-for-wi-fi-networks/)

## How to test

1. Build the website static content and verify the new script appears on
the /scripts page
2. Verify the script slug doesn't collide with existing scripts

---

Built for
[mikermcneil](https://fleetdm.slack.com/archives/D0AFASLRHNU/p1770980976219219?thread_ts=1770980373.078179&cid=D0AFASLRHNU)
by [Kilo for Slack](https://kilo.ai/features/slack-integration)

---------

Co-authored-by: kiloconnect[bot] <240665456+kiloconnect[bot]@users.noreply.github.com>
Co-authored-by: Brock Walters <153771548+nonpunctual@users.noreply.github.com>

docs/scripts.yml

@@ -594,6 +594,21 @@
         bash -c "bash $0 remove >/dev/null 2>/dev/null </dev/null &"
     fi
 
+- name: Disable Wi-Fi auto-join
+  platform: macos
+  description: Disables auto-join for a specified Wi-Fi network (SSID). Update the SSID variable to match the target network name.
+  script: |
+    #!/bin/bash
+
+    # Disable Wi-Fi auto-join for a specified SSID (ie, the network name string on a Mac)
+    # Based on Alan Siu's approach: https://www.alansiu.net/2026/01/22/scripting-disabling-auto-join-for-wi-fi-networks/
+
+    /usr/sbin/ipconfig setverbose 1
+    ntwknm="$(/usr/sbin/ipconfig getsummary "$(/usr/sbin/scutil --nwi | /usr/bin/awk '/Network interfaces:/{print $NF}')" | /usr/bin/awk -v ORS="," -F ' : ' '!/<dictionary>/&&!/<array>/&&!/}/{gsub("^[[:space:]]*","",$0);print "\x22"$1"\x22"":""\x22"$2"\x22"}' | /usr/bin/sed 's/^/{/;s/,$/}/' | /usr/bin/jq -r '.SSID')"
+    /usr/sbin/ipconfig setverbose 0
+    
+    /usr/bin/defaults write /Library/Preferences/com.apple.wifi.known-networks wifi.network.ssid."$ntwknm" -dict-add AutoJoinDisabled -bool TRUE
+
 #
 #  ╦ ╦╦╔╗╔╔╦╗╔═╗╦ ╦╔═╗
 #  ║║║║║║║ ║║║ ║║║║╚═╗