all i did was add a line to app.yml to add plugin, and after that i went with rebuild… i got this error!
help guys !!!
discourse@ubuntu:/var/discourse$ ./launcher rebuild app
WARNING: We are about to start downloading the Discourse base image
This process may take anywhere between a few minutes to an hour, depending on your network speed
Please be patient
Unable to find image 'discourse/discourse:1.3.5' locallyThat’s a routine warning. You should try ./launcher rebuild app after changing app.yml. You may also need to run it twice, if it needs to pull down the base image again.
this got it moving 
i love you man
discourse@ubuntu:/var/discourse$ ./launcher rebuild app
WARNING: We are about to start downloading the Discourse base image
This process may take anywhere between a few minutes to an hour, depending on your network speed
Please be patient
Unable to find image 'discourse/discourse:1.3.5' locally
1.3.5: Pulling from discourse/discourse
6d28225f8d96: Pulling fs layer
980fbaeadfb6: Pulling fs layer
6b76e99b0a75: Pulling fs layer
a3ed95caeb02: Pulling fs layer
a3ed95caeb02: Waiting
… i hope it will finish it
EDIT:
now it stands here, should i just wait?
discourse@ubuntu:/var/discourse$ ./launcher rebuild app
WARNING: We are about to start downloading the Discourse base image
This process may take anywhere between a few minutes to an hour, depending on your network speed
Please be patient
Unable to find image 'discourse/discourse:1.3.5' locally
1.3.5: Pulling from discourse/discourse
6d28225f8d96: Pulling fs layer
980fbaeadfb6: Pulling fs layer
6b76e99b0a75: Pulling fs layer
a3ed95caeb02: Pulling fs layer
a3ed95caeb02: Waiting
6d28225f8d96: Verifying Checksum
6d28225f8d96: Download complete
a3ed95caeb02: Verifying Checksum
a3ed95caeb02: Download complete
6d28225f8d96: Pull complete
a3ed95caeb02: Verifying Checksum
a3ed95caeb02: Download complete
6d28225f8d96: Pull complete
6b76e99b0a75: Verifying Checksum
6b76e99b0a75: Download complete
980fbaeadfb6: Verifying Checksum
980fbaeadfb6: Download complete
980fbaeadfb6: Pull complete
a3ed95caeb02: Verifying Checksum
a3ed95caeb02: Download complete
6d28225f8d96: Pull complete
6b76e99b0a75: Verifying Checksum
6b76e99b0a75: Download complete
980fbaeadfb6: Verifying Checksum
980fbaeadfb6: Download complete
980fbaeadfb6: Pull completethe rebuild process can take 10-15 minutes, so be patient 
nice , sorry for trouble im totaly noob when it comes to discourse but damn i love it !
its doing its thing, thank you bro again!
For me – for whatever reason – if I actually want to upgrade Discourse, I have to run that command again after it pulls down the new base image. You may need to do the same.
yea i had to do it again, but as i saw, and im afraid i just destroyed my discourse… it added new port or something like that, i hardly could see it on cmd
still not done, but i wish i didnt destroyed my forum it had much in it
i think its almost done…
2016-06-22 14:26:21 UTC [43-2] LOG: received fast shutdown request
2016-06-22 14:26:21 UTC [43-3] LOG: aborting any active transactions
2016-06-22 14:26:21 UTC [50-2] LOG: autovacuum launcher shutting down
I, [2016-06-22T14:26:21.409261 #14] INFO -- : Sending TERM to exec chpst -u redis -U redis /usr/bin/redis-server /etc/redis/redis.conf pid: 156
2016-06-22 14:26:21 UTC [47-1] LOG: shutting down
156:signal-handler (1466605581) Received SIGTERM scheduling shutdown...
156:M 22 Jun 14:26:21.423 # User requested shutdown...
156:M 22 Jun 14:26:21.423 * Saving the final RDB snapshot before exiting.
156:M 22 Jun 14:26:21.508 * DB saved on disk
156:M 22 Jun 14:26:21.508 # Redis is now ready to exit, bye bye...
2016-06-22 14:26:21 UTC [47-2] LOG: database system is shut down
edit2: ALL DONE and its working :))) man im glad its done
It depends on the speed of your network (for downloading the new image) and the speed of your CPU and disk (for the build).
I would say on most average servers it’s about 8 minutes, but on a very fast server it can be as low as 3 minutes.
it has been done by aprox 10min
thanks for all support guys, really!!!
this makes discourse what it is, perfect candidate for my forum