ci: run documentation workflow on workflow changes
ci: run documentation workflow on workflow changes

Let's run the documentation GitHub workflow when the related YAML file
changes, in order to make sure that the workflow is still working as
expected after the change.

Signed-off-by: Quentin Monnet <d6b8e48afb2534b213e391cab43016505747a234@isovalent.com>

michi-covalent/cilium,michi-covalent/cilium,cilium/cilium,cilium/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium