Fix Windows BEFORE_ALL script - use folded multiline with && chaining

Author: ciaranra

.github/workflows/python-release.yml

@@ -121,21 +121,14 @@ jobs:
           CIBW_ENVIRONMENT_WINDOWS: >
             PATH="C:\\Users\\runneradmin\\.pecos\\llvm\\bin;$PATH"
             LLVM_SYS_140_PREFIX="C:\\Users\\runneradmin\\.pecos\\llvm"
-          CIBW_BEFORE_ALL_WINDOWS: |
-            echo "=== Installing LLVM using pecos-llvm-utils ==="
-            rustup update
-            echo "=== Running pecos-llvm install ==="
-            cargo run --release -p pecos-llvm-utils --bin pecos-llvm -- install --force
-            echo "=== Checking LLVM installation ==="
-            if [ -d "C:\\Users\\runneradmin\\.pecos\\llvm" ]; then
-              echo "LLVM directory exists"
-              ls -la "C:\\Users\\runneradmin\\.pecos\\llvm"
-              ls -la "C:\\Users\\runneradmin\\.pecos\\llvm\\bin" || echo "bin directory not found"
-            else
-              echo "ERROR: LLVM directory not found!"
-              exit 1
-            fi
-            echo "=== Verifying LLVM_SYS_140_PREFIX ==="
+          CIBW_BEFORE_ALL_WINDOWS: >
+            echo "=== Installing LLVM using pecos-llvm-utils ===" &&
+            rustup update &&
+            echo "=== Running pecos-llvm install ===" &&
+            cargo run --release -p pecos-llvm-utils --bin pecos-llvm -- install --force &&
+            echo "=== Checking LLVM installation ===" &&
+            (test -d "C:\\Users\\runneradmin\\.pecos\\llvm" && echo "LLVM directory exists" && ls -la "C:\\Users\\runneradmin\\.pecos\\llvm" && (ls -la "C:\\Users\\runneradmin\\.pecos\\llvm\\bin" || echo "bin directory not found")) || (echo "ERROR: LLVM directory not found!" && exit 1) &&
+            echo "=== Verifying LLVM_SYS_140_PREFIX ===" &&
             echo "LLVM_SYS_140_PREFIX will be set to: C:\\Users\\runneradmin\\.pecos\\llvm"
           CIBW_BEFORE_BUILD_WINDOWS: "pip install delvewheel"
           CIBW_REPAIR_WHEEL_COMMAND_WINDOWS: >