fix(ci): copy pnpm binary as pnpm.exe on Windows instead of symlink (#224)

Author: jdalton

.github/actions/setup/action.yml

@@ -63,7 +63,12 @@ runs:
             exit 1
           fi
           chmod +x "$PNPM_BIN"
-          ln -sf "$PNPM_BIN" "$PNPM_DIR/pnpm"
+          # Create pnpm alias. Windows needs a .exe copy; Unix uses a symlink.
+          if [[ "$ASSET" == *.exe ]]; then
+            cp "$PNPM_BIN" "$PNPM_DIR/pnpm.exe"
+          else
+            ln -sf "$PNPM_BIN" "$PNPM_DIR/pnpm"
+          fi
         fi
         echo "$PNPM_DIR" >> "${GITHUB_PATH:-/dev/null}"