fix(ci): portable hash parsing in nix-hashes workflow (#11533)

.github/workflows/nix-hashes.yml

@@ -58,10 +58,8 @@ jobs:
           # Build with fakeHash to trigger hash mismatch and reveal correct hash
           nix build ".#packages.${SYSTEM}.node_modules_updater" --no-link 2>&1 | tee "$BUILD_LOG" || true
 
-          HASH="$(grep -E 'got:\s+sha256-' "$BUILD_LOG" | sed -E 's/.*got:\s+(sha256-[A-Za-z0-9+/=]+).*/\1/' | head -n1 || true)"
-          if [ -z "$HASH" ]; then
-            HASH="$(grep -A2 'hash mismatch' "$BUILD_LOG" | grep 'got:' | sed -E 's/.*got:\s+(sha256-[A-Za-z0-9+/=]+).*/\1/' | head -n1 || true)"
-          fi
+          # Extract hash from build log with portability
+          HASH="$(grep -oE 'sha256-[A-Za-z0-9+/=]+' "$BUILD_LOG" | tail -n1 || true)"
 
           if [ -z "$HASH" ]; then
             echo "::error::Failed to compute hash for ${SYSTEM}"