Add documentation on building from sources
What does this MR do?
Adds a section to
docs/install/index.md explaining how to build from sources and particularly how to build the Runner Docker image.
Why was this MR needed?
See #4613 (closed)
Are there points in the code the reviewer needs to double check?
Does this MR meet the acceptance criteria?
- Documentation created/updated
- Added tests for this feature/bug
In case of conflicts with
master- branch was rebased