fix(ci): keep rolldown download keyed to runner OS, not Rust target

The rolldown binding is loaded by Node.js on the host runner to run
JS build steps (rolldown build-node, vite build-types, etc.), not
cross-compiled into the output. Downloading a musl binding on a glibc
runner would cause binding.cjs to fail to load.

Author: fengmk2

.github/actions/download-rolldown-binaries/action.yml

@@ -20,18 +20,15 @@ runs:
     - name: Install previous release
       shell: bash
       run: |
+        # Always download the binding that matches the runner OS (not the
+        # Rust cross-compilation target). The rolldown binding is loaded by
+        # Node.js on the host to run JS build steps, not cross-compiled.
         if ${{ runner.os == 'Windows' }}; then
           export TARGET="win32-x64-msvc"
+        elif ${{ runner.os == 'Linux' }}; then
+          export TARGET="linux-x64-gnu"
         elif ${{ runner.os == 'macOS' }}; then
           export TARGET="darwin-arm64"
-        elif [[ "${{ inputs.target }}" == *"musl"* ]]; then
-          case "${{ inputs.target }}" in
-            x86_64*)  export TARGET="linux-x64-musl" ;;
-            aarch64*) export TARGET="linux-arm64-musl" ;;
-            *) echo "Unknown musl target: ${{ inputs.target }}"; exit 1 ;;
-          esac
-        else
-          export TARGET="linux-x64-gnu"
         fi
 
         # Pin to the version from checked-out rolldown source to avoid mismatch