Don't copy docs for mold

x86.dockerfile

@@ -52,6 +52,7 @@ RUN wget https://github.com/rui314/mold/releases/download/v1.7.1/mold-1.7.1-x86_
     mv mold-1.7.1-x86_64-linux/bin/* /usr/bin/ && \
     mv mold-1.7.1-x86_64-linux/lib/* /usr/lib/ && \
     mv mold-1.7.1-x86_64-linux/libexec/* /usr/libexec/ && \
-    mv mold-1.7.1-x86_64-linux/share/* /usr/share/
+    rm -r mold-1.7.1-x86_64-linux && \
+    rm mold-1.7.1-x86_64-linux.tar.gz
 
 COPY --from=trunkbuild /usr/local/cargo/bin/trunk /usr/local/cargo/bin/trunk