Octez_smart_rollup.Installer_configSourceHandling of YAML configuration file used by the kernel installer.
A configuration has the form: ``` instructions:
parse_yaml content parses content as a YAML representing the configuration of the kernel installer, and returns the corresponding set of instructions.
generate_yaml instrs generates the YAML representation of instrs.
emit_yaml instrs generates the YAML representation of instrs in textual format.