Enable multi-platform image builds

[sebrandon1]

Modifies the Dockerfile and the workflows to build correctly for each platform, arm64 and amd64.

There are two automation workflows:

• .github/workflows/pre-main.yaml (creates the 'unstable' image)
• .github/workflows/tnf-image.yaml (creates the tagged releases)

These are both now modified to build images for both arm64 and amd64 images, package them into a manifest, and then push to our registries.

When I tested this locally, you can see I created an image named bapalm/test-suite:v0.0.1:

It says "See Child Manifests".

If you expand on the child manifests you can see:

[dcibot]

from change #1942:

• FAILURE https://www.distributed-ci.io/jobs/cf4c3ce0-a640-4bdc-b0cc-e72b732e0629/jobStates

[sebrandon1]

@ramperher Can you take a look at this DCI job result?

task path: /usr/share/ansible/collections/ansible_collections/redhatci/ocp/roles/verify_tests/tasks/parse_junit_file.yml:37
fatal: [jumphost]: FAILED! => {"changed": false, "msg": "The following expectations failed: [{'failed_expectation': {'testcase': '^((?!networking-reserved-partner-ports|access-control-security-context|platform-alteration-tainted-node-kernel|affiliated-certification-container-is-certified-digest|preflight-HasUniqueTag|preflight-ScorecardBasicSpecCheck|preflight-RequiredAnnotations|preflight-ScorecardOlmSuiteCheck).)*$', 'passed': True}, 'actual_result': {'testcase': 'affiliated-certification-helmchart-is-certified', 'passed': False}}]"}