Add GitHub Action workflow to update QEMU

[jakirkham]

To aid in keeping QEMU up-to-date in images, it may help to have a GitHub Action that checks for an existing release and if it finds one updates the version...

docker-images/download-qemu-static.sh

Lines 24 to 25 in 7023391

	version='9.1.2'
	build='2.fc41'

...as well as associated checksums...

docker-images/download-qemu-static.sh

Lines 33 to 35 in 7023391

	24430d7864630c06fcb4865bee63f7a5b57b37b462e7e8a61afef0b9de9d91b6 qemu-aarch64-static
	1391cfcf75de6a13a33b47107b89d711af661538f632b088d4d2c11460b3bce0 qemu-ppc64le-static
	9f9229f2b3baacbebf323f035f216083ea97c125f1ca18525f14c39b60c2e545 qemu-s390x-static