Add environment variable to disable Homebrew auto-update (#959)

Prevent Homebrew from auto-updating during package installation.

Author: VeithMetro

.github/workflows/MacOS build template.yml

@@ -19,9 +19,9 @@ jobs:
     steps:
 # --------- Packages & artifacts ---------
     - name: Install necessary packages
+      env:
+        HOMEBREW_NO_AUTO_UPDATE: 1
       run: |
-          brew update
-          brew upgrade
           brew install ninja zlib
           python3 -m venv venv
           source venv/bin/activate