Removed port env var from dockerfile.

Author: nero120

dockerfile

@@ -2,7 +2,6 @@ FROM node:10.14.2-alpine
 
 # Set environment variables
 ENV XBROWSERSYNC_API_VERSION 1.1.6
-ENV XBROWSERSYNC_API_PORT 8080
 
 WORKDIR /usr/src/api
 
@@ -17,5 +16,5 @@ RUN wget -q -O release.tar.gz https://github.com/xBrowserSync/api/archive/v$XBRO
 RUN npm install --only=production
 
 # Expose port and start api
-EXPOSE $XBROWSERSYNC_API_PORT
+EXPOSE 8080
 CMD [ "node", "dist/api.js"]