Document that custom stacks need to have a CMD that does not terminate

[binduwavell]

Description of problem: It was not clear to me that if I setup a custom stack it needed to end with something like sleep 365d or less +f /dev/null to block the process from terminating.

The sample stack template (in the UI) did not make this clear and the error messages I received didn't help either. I ended up looking at some of your default stack templates and figured it out as this was required for codenvy runners in the past.

Che version: 4.0.0-beta-13-1
Che install directory: ~/Downloads/eclipse-che-4.0.0-beta-13-1
Docker version:

Client:
 Version:      1.10.0
 API version:  1.22
 Go version:   go1.5.3
 Git commit:   590d5108
 Built:        Thu Feb  4 18:18:11 2016
 OS/Arch:      darwin/amd64
Server:
 Version:      1.10.0
 API version:  1.22
 Go version:   go1.5.3
 Git commit:   590d5108
 Built:        Thu Feb  4 19:55:25 2016
 OS/Arch:      linux/amd64

Docker Info:

Containers: 1
 Running: 1
 Paused: 0
 Stopped: 0
Images: 4
Server Version: 1.10.0
Storage Driver: aufs
 Root Dir: /mnt/sda1/var/lib/docker/aufs
 Backing Filesystem: extfs
 Dirs: 20
 Dirperm1 Supported: true
Execution Driver: native-0.2
Logging Driver: json-file
Plugins:
 Volume: local
 Network: bridge null host
Kernel Version: 4.1.17-boot2docker
Operating System: Boot2Docker 1.10.0 (TCL 6.4.1); master : b09ed60 - Thu Feb  4 20:16:08 UTC 2016
OSType: linux
Architecture: x86_64
CPUs: 1
Total Memory: 1.956 GiB
Name: default
ID: S6GZ:TD7N:M4BZ:J6DK:RN3E:455I:YTPI:BDY4:32XR:ONHD:MGDJ:HFVC
Debug mode (server): true
 File Descriptors: 20
 Goroutines: 39
 System Time: 2016-02-07T22:56:03.470098201Z
 EventsListeners: 0
 Init SHA1:
 Init Path: /usr/local/bin/docker
 Docker Root Dir: /mnt/sda1/var/lib/docker
Username: binduwavell
Registry: https://index.docker.io/v1/
Labels:
 provider=virtualbox

Java version: N/A I'm using che.sh run -i (so whatever you have in your container)
Environment details (AWS, VirtualBox, physical, etc.): I'm on my mac using the default dockertoolbox 0.10 and default che 4.0.0-beta-13-1.

[ghost]

Reqs are in the docs https://eclipse-che.readme.io/docs/environments#custom-stacks

[binduwavell]

Awesome, thanks! Would help if the example text when creating a custom stack expected lined this :)