add docker

Dockerfile

@@ -0,0 +1,11 @@
+FROM alpine:latest
+RUN apk update && apk add --no-cache python3 py3-pip
+RUN mkdir -p /opt/ydl_web_ui
+ADD requirements.txt web_ui/ /opt/ydl_web_ui
+WORKDIR /opt/ydl_web_ui
+RUN pip install --disable-pip-version-check --requirement requirements.txt
+RUN pip install --disable-pip-version-check gunicorn
+EXPOSE 3000
+USER nobody
+ENV YDL_API_HOST=
+CMD gunicorn router:app --bind :3000