Fix CI: Add pipefail to catch brew install failures

The install step was succeeding even when brew failed because the pipe
to tee was masking the exit code. This prevented the "Display error logs
on failure" step from running.

Added `set -o pipefail` to ensure that when brew install fails, the step
fails and triggers the error log display, which includes the Cantera
config.log that will show why the cmath header check is failing.

Author: sbryngelson

.github/workflows/homebrew.yml

@@ -44,6 +44,7 @@ jobs:
       
       - name: Install MFC from formula
         run: |
+          set -o pipefail  # Ensure pipe failures are caught
           echo "Creating temporary local tap..."
           brew tap-new mflowcode/test