Fix latest transformer docker image

The docker image after 4.23.1 seems to contain a broken installation
of PIP, and it's also lacking python3-tk. This commit ensures these
are updated and installed before the rest of the dependencies.

dockerfile

@@ -2,7 +2,12 @@ FROM huggingface/transformers-pytorch-gpu
 EXPOSE 7860
 
 ADD . /opt/whisper-webui/
-RUN python3 -m pip install -r /opt/whisper-webui/requirements.txt
+
+# Latest version of transformers-pytorch-gpu seems to lack tk. 
+# Further, pip install fails, so we must upgrade pip first.
+RUN apt-get -y install python3-tk
+RUN  python3 -m pip install --upgrade pip &&\
+     python3 -m pip install -r /opt/whisper-webui/requirements.txt
 
 # Note: Models will be downloaded on demand to the directory /root/.cache/whisper.
 # You can also bind this directory in the container to somewhere on the host.