fix problems when building the docker image on windows

Author: fewi

Diff for: Dockerfile

@@ -1,5 +1,7 @@
 FROM node:latest
 
+RUN apt-get update && apt-get -y install dos2unix
+
 WORKDIR /opt/magic_mirror
 COPY . .
 COPY /modules unmount_modules
@@ -9,6 +11,8 @@ ENV NODE_ENV production
 ENV MM_PORT 8080
 
 RUN npm install
+
+RUN ["dos2unix", "docker-entrypoint.sh"]
 RUN ["chmod", "+x", "docker-entrypoint.sh"]
 
 EXPOSE $MM_PORT