CI: ensure no brew (#37387)

.github/workflows/setup/action.yaml

@@ -26,10 +26,6 @@ runs:
           exit 1
         fi
 
-    # do this after checkout to ensure our custom LFS config is used to pull from GitLab
-    - shell: bash
-      run: git lfs pull
-
     # build cache
     - id: date
       shell: bash

.github/workflows/tests.yaml

@@ -66,6 +66,10 @@ jobs:
     - uses: actions/checkout@v6
       with:
         submodules: true
+    - name: Remove Homebrew from environment
+      run: |
+        FILTERED=$(echo "$PATH" | tr ':' '\n' | grep -v '/opt/homebrew' | tr '\n' ':')
+        echo "PATH=${FILTERED}/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin" >> $GITHUB_ENV
     - uses: ./.github/workflows/setup-with-retry
     - name: Building openpilot
       run: scons