Update Dockerfile

revert changes made in f26f86dd3f5eb47152d4cd3e27594780c13a3cbb

Dockerfile

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