How to manage SCDF stream definition and properties?

I wonder if there is a best practice to store a stream DSL and the apps and deployer properties file associated in a SCM like Git ?
What should a Git project for a SCDF Stream look like ?
And how can we manage versions of a stream ?

Solution

It's been a while but, for sharing, here is what we did. Thanks fiidim, your answer helps us.

Our Git projects look like this :

apps.properties : used to register the apps
definition.txt : the DSL, used to create the stream
arguments.json : deployment properties, used to deploy the stream
YAML files : one for each app of the stream, with business properties

We use Spring Cloud Config (with scdf profile) for business properties of the apps, that's why we separate deployment and business properties.
We call the SCDF server with the REST API to register the apps, create and deploy the stream.

With a ticktock example :
apps.properties :

source.time=docker:springcloudstream/time-source-kafka:3.2.1
sink.log=docker:springcloudstream/log-sink-kafka:3.2.1

definition.txt :
time | log

arguments.json :

{  
  "version.time": "3.2.1",  
  "version.log": "3.2.1",  
  "app.*.spring.profiles.active": "scdf",  
  "app.*.spring.cloud.config.uri": "http://my-scc-server/config",  
  "deployer.*.kubernetes.imagePullPolicy=Always"  
}

mystream-log.yml
log.expression: #root

mystream-time.yml

spring:
  cloud:
   stream:
     poller:
       time-unit: SECONDS
       fixed-delay: 10