Update Dockerfile

Dockerfile

@@ -36,7 +36,8 @@ ENV TORCH_CUDA_ARCH_LIST="7.0;7.5;8.0;8.6"
 #     pip install submodules/diff-gaussian-rasterization
 
 COPY --chown=user requirements.txt InstantSplat/requirements.txt
-RUN pip install -r ./requirements.txt
+RUN cd InstantSplat && \
+    pip install -r requirements.txt
 
 RUN cd InstantSplat && \
     pip install submodules/simple-knn && \