[nat64_appliance] Download nat64 image

[mnietoji]

[nat64_appliance] Add support for downloading pre-built images

Introduce cifmw_nat64_appliance_image_url parameter to download
pre-built NAT64 images, with optional checksum verification support.

Signed-off-by: Miguel Angel Nieto Jimenez <mnietoji@redhat.com>

[hjensas]

The molecule job passed, https://softwarefactory-project.io/zuul/t/rdoproject.org/build/637398ca48fc43fdbf147dd8ee4d19f9

LGTM. Thanks!

[evallesp]

LGTM
Edit: This has a blocker, so not approving.

no valid

[openshift-ci]

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[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/c5cc6858dbe04c2e89d7c1764cee8166

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 43m 28s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 28m 29s
✔️ cifmw-crc-podified-edpm-baremetal SUCCESS in 1h 26m 30s
✔️ cifmw-pod-zuul-files SUCCESS in 4m 24s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 9m 11s
❌ cifmw-pod-pre-commit FAILURE in 8m 25s
✔️ build-push-container-cifmw-client SUCCESS in 17m 10s
❌ cifmw-molecule-nat64_appliance FAILURE in 17m 19s

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/63e9f9813a844401bad32864652163e5

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 55m 10s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 24m 35s
✔️ cifmw-crc-podified-edpm-baremetal SUCCESS in 1h 40m 15s
✔️ cifmw-pod-zuul-files SUCCESS in 4m 36s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 8m 09s
✔️ cifmw-pod-pre-commit SUCCESS in 7m 44s
✔️ build-push-container-cifmw-client SUCCESS in 20m 07s
❌ cifmw-molecule-nat64_appliance FAILURE in 19m 54s

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/3b47de65a3934955b9ae76706f682538

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 06m 37s
❌ podified-multinode-edpm-deployment-crc FAILURE in 38m 32s
❌ cifmw-crc-podified-edpm-baremetal FAILURE in 46m 07s
✔️ cifmw-pod-zuul-files SUCCESS in 4m 32s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 8m 31s
✔️ cifmw-pod-pre-commit SUCCESS in 7m 53s
✔️ build-push-container-cifmw-client SUCCESS in 16m 28s
❌ cifmw-molecule-nat64_appliance POST_FAILURE in 9m 43s

[mnietoji]

recheck

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/1f7a606a0bee47819e6fcd965248d094

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 44m 37s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 27m 55s
❌ cifmw-crc-podified-edpm-baremetal RETRY_LIMIT in 35m 49s
✔️ cifmw-pod-zuul-files SUCCESS in 5m 27s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 9m 27s
✔️ cifmw-pod-pre-commit SUCCESS in 8m 05s
✔️ build-push-container-cifmw-client SUCCESS in 22m 06s
❌ cifmw-molecule-nat64_appliance FAILURE in 16m 14s

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/9ba431bd86ed49f785b59a5f2ea54eef

❌ openstack-k8s-operators-content-provider FAILURE in 5m 54s
⚠️ podified-multinode-edpm-deployment-crc SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider
⚠️ cifmw-crc-podified-edpm-baremetal SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider
✔️ cifmw-pod-zuul-files SUCCESS in 4m 30s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 7m 57s
✔️ cifmw-pod-pre-commit SUCCESS in 8m 00s
✔️ build-push-container-cifmw-client SUCCESS in 17m 40s
❌ cifmw-molecule-nat64_appliance FAILURE in 14m 58s

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/dd53e8918946434b961695d80bb82c11

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 06m 24s
❌ podified-multinode-edpm-deployment-crc FAILURE in 35m 13s
❌ cifmw-crc-podified-edpm-baremetal FAILURE in 47m 23s
✔️ cifmw-pod-zuul-files SUCCESS in 4m 30s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 8m 36s
✔️ cifmw-pod-pre-commit SUCCESS in 7m 47s
✔️ build-push-container-cifmw-client SUCCESS in 21m 02s
✔️ cifmw-molecule-nat64_appliance SUCCESS in 15m 41s

[mnietoji]

recheck

[hjensas]

/lgtm

I have a nit comment, but I don't think it should block merging this PR.