RFC: add encrypted scratch space for sandbox #3244

Job	Run time
authorize	1s
e2e / libvirt_e2e_arch_prep	5s
e2e / prep_install	6s
e2e / caa_image_s390x / build and push (dev, linux/s390x)	5m 23s
e2e / caa_image_amd64 / build and push (dev, linux/amd64)	4m 11s
e2e / caa_image_s390x / build and push (release, linux/s390x)	3m 44s
e2e / image / build and push (dev, linux/amd64)	4m 9s
e2e / caa_image_amd64 / build and push (release, linux/amd64)	3m 17s
e2e / image / build and push (release, linux/amd64,linux/s390x,linux/ppc64le)	8m 26s
e2e / podvm_builder / Create pod vm builder image (ubuntu, ubuntu-24.04)	2m 2s
e2e / podvm_mkosi_amd64 / Build mkosi image	8m 22s
e2e / podvm_mkosi_s390x / Build mkosi image	12m 35s
e2e / podvm_binaries / Create pod vm binaries image (ubuntu, amd64)	1m 48s
e2e / podvm_binaries / Create pod vm binaries image (ubuntu, s390x)	2m 10s
e2e / podvm / Create pod vm image (ubuntu, amd64, generic)	8m 51s
e2e / podvm / Create pod vm image (ubuntu, amd64, vsphere)	7m 16s
e2e / podvm / Create pod vm image (ubuntu, s390x, generic)	11m 59s
e2e / E2E tests on libvirt for the amd64 architecture (none) / test	30m 56s
e2e / E2E tests on libvirt for the s390x architecture (none) / test	23m 3s
e2e / libvirt (containerd, none, ubuntu, generic, amd64) / test	22m 48s
e2e / libvirt (crio, none, ubuntu, generic, amd64) / test	22m 50s
	3h 4m 2s

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