strengthen brew + make both builds non-blocking

Author: TheMrIron2

.github/workflows/build.yml

@@ -10,6 +10,7 @@ jobs:
   build:
     runs-on: ${{ matrix.os }}
     strategy:
+      fail-fast: false
       matrix:
         os: [macos-15-intel, ubuntu-latest]
 
@@ -26,13 +27,19 @@ jobs:
       if: matrix.os == 'macos-15-intel'
       shell: arch -x86_64 bash -e {0}
       run: |
-        /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
-        echo >> /Users/runner/.bash_profile
-        echo 'eval "$(/usr/local/bin/brew shellenv bash)"' >> /Users/runner/.bash_profile
+        if ! command -v brew >/dev/null 2>&1; then
+          /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
+        fi
+
         eval "$(/usr/local/bin/brew shellenv bash)"
+
         brew install autoconf automake openssl libelf ncurses zlib gmp wget pkg-config texinfo
-        # avoid link error on runner
-        brew install python@3.11 || true 
+
+        # python@3.11 may fail to link on GitHub's Intel macOS runners because /usr/local/bin/python3.11 already exists.
+        # keg still installs, the build step uses brew --prefix plus local shims instead of relying on Homebrew's global symlinks
+        brew install python@3.11 || true
+
+        brew --prefix python@3.11
 
     - name: Runs all the stages in the shell
       if: matrix.os == 'ubuntu-latest'