CWL/Calrissian feature: setup/configuration and related documentation

[soxofaan]

Setting up the initial PoC of CWL with Calrissian #936 for https://github.com/EOEPCA/roadmap/issues/41 involved a bunch of manual k8s setup.

This should be documented, automated where possible and related configuration hooks should be provided

some other related todo notes that could be covered here:

openeo-geopyspark-driver/openeogeotrellis/integrations/calrissian.py

Lines 80 to 81 in 85ac055

	# TODO: config for this?
	self._security_context = kubernetes.client.V1SecurityContext(run_as_user=1000, run_as_group=1000)

openeo-geopyspark-driver/openeogeotrellis/integrations/calrissian.py

Lines 187 to 194 in 85ac055

	calrissian_arguments = [
	# TODO (still) need for this debug flag?
	"--debug",
	# TODO: better RAM/CPU values than these arbitrary ones?
	"--max-ram",
	"2G",
	"--max-cores",
	"1",