Merge pull request #2 from FileFighter/feature/backendPort FF-46

changed CMD to write REST_PORT to file in public folder FF-46

Author: qvalentin

webapp_provider/dockerfile

@@ -12,4 +12,4 @@ RUN npm install
 COPY . .
 
 EXPOSE 5000
-CMD ["npx", "serve","-s","public"]
+CMD echo $REST_PORT > /usr/src/app/public/backend.cfg && npx serve -s public