Only change ownership for mteb folder

Dockerfile

@@ -4,11 +4,11 @@ RUN apt update
 RUN apt install -y git
 
 RUN useradd -m -u 1000 user
-RUN chown -R 1000 /
-USER user
 ENV PATH="/home/user/.local/bin:$PATH"
 
 RUN git clone https://github.com/embeddings-benchmark/mteb.git
+RUN chown -R 1000 /mteb
+USER user
 
 COPY --chown=user ./main.py /mteb/main.py
 COPY --chown=user ./requirements.txt /mteb/requirements.txt