fix(ruby): include sitedir in rbconfig

ruby on rails depends on bootsnap which requires it to be defined.
otherwise, it crashes when the app starts

projects/ruby-lang.org/package.yml

@@ -96,7 +96,6 @@ build:
       - --disable-multiarch                        # ^^
       - --with-vendordir=no     # is empty so don’t pollute
       - --with-vendorarchdir=no # ^^
-      - --with-sitedir=no       # ^^
       - --with-sitearchdir=no   # ^^
       - --enable-yjit  # https://github.com/pkgxdev/pantry/issues/3538