Make ci pre setup script a bit more ARM resilient

Author: cmsj

scripts/github-ci-pre.sh

@@ -7,7 +7,9 @@ set -o pipefail
 export IS_CI=1
 
 # Remove the pre-installed Cocoapods binary
-rm /usr/local/bin/pod
+if [ -f /usr/local/bin/pod ]; then
+    rm /usr/local/bin/pod
+fi
 
 # We can't even installdeps without greadlink existing, so grab that first
 brew install coreutils