Update Dockerfile

Removed hardcoding port 8080 in image, allowing more flexibility for complex docker deployments.

Dockerfile

@@ -346,8 +346,6 @@ RUN \
     #rm -R /home/wekan/python
     #rm /home/wekan/install_meteor.sh
 
-ENV PORT=8080
-EXPOSE $PORT
 USER wekan
 
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