Try again to fix mac workflow

Author: lrettig

.github/workflows/ci.yml

@@ -11,7 +11,6 @@ on:
 jobs:
   build:
     strategy:
-      fail-fast: false
       matrix:
         include:
           - runner: [runs-on, runner=32cpu-linux-x64, "run-id=${{ github.run_id }}"]
@@ -57,7 +56,7 @@ jobs:
           sudo apt-get -y install gcc-riscv64-unknown-elf
 
       - name: Install riscv-tools
-        if: matrix.runner == 'macos-13'
+        if: matrix.os == 'macos'
         run: |
           brew tap riscv-software-src/riscv
           brew install riscv-tools