Update Dockerfile, install wis2downloader from pypi

wis2downloader/Dockerfile

@@ -28,8 +28,8 @@ COPY . /app
 # Set the working directory to /app
 WORKDIR /app
 
-# install wis2downloader from github main branch
-RUN pip3 install https://github.com/wmo-im/wis2downloader/archive/main.zip
+# install wis2downloader from pypi
+RUN pip install wis2downloader
 
 # add wis2box.cron to crontab
 COPY ./clean.cron /etc/cron.d/clean.cron
@@ -43,4 +43,4 @@ RUN chmod +x /app/entrypoint.sh
 ENTRYPOINT [ "/app/entrypoint.sh" ]
 
 # Run wis2downloader when the container launches
-CMD ["gunicorn","--bind","0.0.0.0:5000","--pythonpath","/usr/local/lib/python3.9/site-packages/","--workers", "1", "wis2downloader.app:app"]
+CMD ["gunicorn","--bind","0.0.0.0:5000","--pythonpath","/usr/local/lib/python3.9/site-packages/","--workers", "1", "wis2downloader.app:app"]