[analysis] container initialization with data (init payload) in dapps

[VanDavv]

During the application development, there are cases when an image prepared once can be used for different purposes by just giving it a different initial payload.

For example, having an NGINX image, the internal configuration and installed applications can stay the same, whereas the HTML files to be served can be uploaded during the initialization stage.

With this task, we should make sure we have an initialization mechanism, where users can provide an initial payload that will be sent to the app image.

Todo:

• Prepare design doc for new "transfer" command for descriptor, based on ExecScript.TRANSSFER

[shadeofblue]

Well, this one should probably go through a GAP process first before we start the implementation

[VanDavv]

@stranger80 do we have this included in any GAP already?

[stranger80]

We spoke about this a while ago. GAOM descriptor does include service.init attribute which specifies the ExeScript sequence to execute when launching a service. This ExeScript may include TRANSFER statements to upload arbitrary content to the runtime, for the payload to use.