add docker files

docker/Dockerfile

@@ -0,0 +1,17 @@
+FROM node:lts-alpine as build-client
+
+RUN echo "Build WebPlay Client"
+RUN apk update
+RUN apk add git
+RUN git clone https://code.anufrij.de/WebPlay/client.git && cd client
+RUN sed -i '/"electron":/d' client/package.json
+RUN sed -i '/"electron-builder":/d' client/package.json
+RUN sed -i '/"express":/d' client/package.json
+
+RUN cd client && npm install 
+RUN cd client && npm run build
+
+FROM nginx:alpine
+
+COPY --from=build-client /client/dist /usr/share/nginx/html
+COPY ./nginx.conf /etc/nginx/conf.d/default.conf