Specified --vcpkg-root with scoop directory

Author: hsbt

.github/workflows/windows.yml

@@ -154,7 +154,7 @@ jobs:
 
       - name: Install libraries with vcpkg
         run: |
-          vcpkg install
+          vcpkg install --vcpkg-root=C:\Users\runneradmin\scoop\apps\vcpkg\current
         working-directory: src
 
       # TODO: We should use `../src` instead of `D:/a/ruby/ruby/src`