CORS-3191: add etcd image dep to installer

[r4f4]

With the transition from terraform to CAPI, the Installer has now to run a controlplane on the host with etcd. This first step builds an intermediary container image from which the Installer will be able to extract binaries during build time.

[openshift-ci-robot]

@r4f4: This pull request references CORS-3191 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.16.0" version, but no target version was set.

In response to this:

With the transition from terraform to CAPI, the Installer has now to run a controlplane on the host with etcd. This first step builds an intermediary container image from which the Installer will be able to extract binaries during build time.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-bot]

Validating 1 file(s)...
Validating images/ose-installer-etcd-artifacts.yaml...
Traceback (most recent call last):
File "/usr/local/bin/validate-ocp-build-data", line 33, in
sys.exit(load_entry_point('rh-ocp-build-data-validator==0.2.5', 'console_scripts', 'validate-ocp-build-data')())
File "/usr/local/lib/python3.9/site-packages/validator/main.py", line 87, in main
validate(f, args.exclude_vpn, args.schema_only)
File "/usr/local/lib/python3.9/site-packages/validator/main.py", line 48, in validate
support.fail_validation(msg, parsed)
File "/usr/local/lib/python3.9/site-packages/validator/support.py", line 14, in fail_validation
raise exceptions.ValidationFailed(msg)
validator.exceptions.ValidationFailed: CGit validation failed for images/ose-installer-etcd-artifacts.yaml (https://pkgs.devel.redhat.com/cgit/containers/ose-installer-etcd-artifacts)
Returned error: Repo was not found in CGit cache.
If you didn't request a DistGit repo yet, please check https://mojo.redhat.com/docs/DOC-1168290
But if you already obtained one, make sure its name matches the YAML filename

[joepvd]

/cherrypick openshift-4.17

[openshift-cherrypick-robot]

@joepvd: once the present PR merges, I will cherry-pick it on top of openshift-4.17 in a new PR and assign it to you.

In response to this:

/cherrypick openshift-4.17

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[r4f4]

Closing in favor of #4774