ci: Update brew only on macos-15-large

Signed-off-by: Nir Soffer <[email protected]>

Author: nirs

.github/workflows/lima.yaml

@@ -53,9 +53,11 @@ jobs:
           make ARCH=arm64
           sudo make PREFIX=/opt/socket_vmnet.arm64 install.bin install.doc
           if file /opt/socket_vmnet.arm64/bin/* | grep -q x86_64 ; then false ; fi
+      - name: Update brew (macos-15-large)
+        if: matrix.platform == "macos-15-large"
+        run: brew update
       - name: Install Lima
         run: |
-          brew update
           brew install lima
           limactl sudoers >etc_sudoers.d_lima
           sudo install -o root etc_sudoers.d_lima "/private/etc/sudoers.d/lima"