create swapfiles also for CUDA jobs

[h-vetinari]

The regular linux job sets up a swapfile

staged-recipes/.azure-pipelines/azure-pipelines-linux.yml

Lines 24 to 29 in 6825bf2

	- script: |
	sudo fallocate -l 10GiB /swapfile || true
	sudo chmod 600 /swapfile || true
	sudo mkswap /swapfile || true
	sudo swapon /swapfile || true
	displayName: Create swap file

but the CUDA builds don't. Fix that

[github-actions]

Hi! This is the staged-recipes linter and your PR looks excellent! 🚀

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR () and found it was in an excellent condition.