ci(cron): publish weekly rebuilds

[andrewazores]

Welcome to Cryostat3! 👋

Before contributing, make sure you have:

• [x] Read the contributing guidelines
• [x] Linked a relevant issue which this PR resolves
• [x] Linked any other relevant issues, PR's, or documentation, if any
• [x] Resolved all conflicts, if any
• [x] Rebased your branch PR on top of the latest upstream main branch
• [x] Attached at least one of the following labels to the PR: [chore, ci, docs, feat, fix, test]
• [x] Signed all commits using a GPG signature

To recreate commits with GPG signature git fetch upstream && git rebase --force --gpg-sign upstream/main

---

See https://github.com/cryostatio/cryostat3/pull/427 See https://github.com/cryostatio/cryostat-reports/pull/234

Description of the change:

This change allows an environment variable to be configured so that...

Motivation for the change:

This change is helpful because users may want to...

How to manually test:

1. Run CRYOSTAT_IMAGE=quay.io... bash smoketest.bash...
2. ...

[andrewazores]

/build_test

[github-actions[bot]]

Workflow started at 5/2/2024, 11:07:51 AM. View Actions Run.

[github-actions[bot]]

No GraphQL schema changes detected.

[github-actions[bot]]

No OpenAPI schema changes detected.

[github-actions[bot]]

CI build and push: All tests pass ✅ (JDK17) https://github.com/cryostatio/cryostat3/actions/runs/8926139592