fixing dockerfile

Author: mdkul22

Dockerfile

@@ -26,7 +26,7 @@ RUN git submodule init && git submodule update --recursive
 # Create a build directory
 RUN mkdir build 
 RUN cd build && cmake ..
-RUN make -j$(nproc) 
+RUN cd build && make -j$(nproc) 
 
 FROM ubuntu:20.04