Allow Dockerfile to use local requirements.txt (pandas-dev#57904)

Author: WillAyd

Dockerfile

@@ -9,6 +9,6 @@ RUN apt-get install -y build-essential
 RUN apt-get install -y libhdf5-dev libgles2-mesa-dev
 
 RUN python -m pip install --upgrade pip
-RUN python -m pip install \
-    -r https://raw.githubusercontent.com/pandas-dev/pandas/main/requirements-dev.txt
+COPY requirements-dev.txt /tmp
+RUN python -m pip install -r /tmp/requirements-dev.txt
 CMD ["/bin/bash"]