Update Dockerfile

Dockerfile

@@ -11,7 +11,9 @@ RUN apt-get update && apt-get install -y portaudio19-dev
 COPY ./requirements.txt /code/requirements.txt
 
 # Install the Python dependencies
-RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt
+RUN python -m venv .env \
+    && . .env/bin/activate \
+    && pip install --no-cache-dir --upgrade -r /code/requirements.txt
 
 # Copy the current directory contents into the container at /code
 COPY . .