Front dockerfile (#88)

* readding react-native-paper because expo build need it

* added Dockerfile with nginx.conf for hosting

* added front to docker-compose prod

front/Dockerfile

@@ -0,0 +1,18 @@
+# a Dockerfile to build the expo web app and serve it with nginx
+#
+# Build the app
+FROM node:16-alpine as build
+WORKDIR /app
+COPY package.json yarn.lock ./
+RUN yarn install
+# install expo cli
+RUN yarn global add expo-cli
+# add sharp-cli (^2.1.0) for faster image processing
+RUN yarn global add sharp-cli@^2.1.0
+COPY . .
+RUN expo build:web
+
+# Serve the app
+FROM nginx:1.21-alpine
+COPY --from=build /app/web-build /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf