Extract customisation block from Dockerfile

Registered by Duong Ha-Quang

Currently, it's not convenience for pure operators to read the Dockerfiles and find which customization block they need. We can do something to make our documentation better:

- Write script to extract customizable block from Dockerfiles and put it in Kolla's documentation.
- Define comment convention for these blocks to extract it later in documentation.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Duong Ha-Quang
Direction:
Approved
Assignee:
Duong Ha-Quang
Definition:
Approved
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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Sprints

Whiteboard

I think this would be nice to have, marking as approved - pbourke

(?)

Work Items

Work items:
Extract block from Dockerfile to put in doc: TODO
Define comment convention for these blocks: TODO
Extract comment and put it together with block's name: TODO

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