Update Dockerfile

Dockerfile

@@ -18,7 +18,7 @@ WORKDIR $HOME/app
 RUN git clone -b dev https://github.com/camenduru/DiffBIR $HOME/app
 
 # Install Python dependencies
-RUN pip install -q einops pytorch_lightning gradio omegaconf xformers==0.0.20 transformers lpips
+RUN pip install -q einops pytorch_lightning gradio omegaconf xformers==0.0.20 transformers lpips opencv-python
 
 # Install open_clip from GitHub
 RUN pip install -q git+https://github.com/mlfoundations/open_clip@v2.20.0