Add freecodecamp scraper

[benoit74]

Rationale

• Fix Add freecodecamp support #804
• small fix to openAPI specification

Changes

• dispatcher/backend: freecodecamp has been added to the ScheduleCategory and Offliner enums
• dispatcher/backend: DockerImageName for freecodecamp has been set to openzim/freecodecamp
• dispatcher/backend: freecodecamp flags schema has been defined
• dispatcher/backend: freecodecamp output location has been defined
• dispatcher/frontend-ui: freecodecamp has been added to categories, warehouse_paths and offliners in src/contstants.js
• openAPI specification has been adapted to reflect the fact that POST /tasks/{task_id} operation needs a worker_name set as query parameter

Tests

• a recipe for freecodecamp has been manually created successfully locally, flags have been set ; the recipe has not been requested / ran by any worker locally
• openAPI spec adaptation has been manually tested locally with success
• an automated test for freecodecamp schedule creation + flags modifications has been created

[rgaudin]

Good ; thanks for the test, it's nice to have.
I am requesting changes mostly because of the category/warehouse_path that @kelson42 must answer first.
If you can make a minor release about output param, that would be nice as this is a new scraper.

[kelson42]

I am requesting changes mostly because of the category/warehouse_path that @kelson42 must answer first.

I guess I missed the question, sorry. But if the question is: do we need a dedicated (zimfarm) category, IMHO yes.

[benoit74]

@rgaudin Good catch on output folder and languages list!

I'm a bit puzzled about output flag, I see no reason to keep it in the list of scraper flags and force it to a '/output' value since it is then setup properly at

zimfarm/dispatcher/backend/src/utils/offliners.py

Lines 47 to 51 in 576565b

	flags[
	offliner_def.std_output
	if isinstance(offliner_def.std_output, str)
	else "output"
	] = str(mount_point)

but other scrapers have this flag in their schema. Let discuss it live maybe, it will be easier.

I confirmed via slack with Kelson that we have to create both a new category and a new folder, because he expects us to quickly create many FCC ZIMs.

[rgaudin]

OK then ; I'll walk you through creating those folders

[benoit74]

There is a reason why the output flag is kept in each scraper flags ; it is "mandatory" to avoid the UI / API having mixed feeling about this weird flag. I reverted the change.