Add weekly release automation trigger

[AnnaZivkovic]

Adds GitHub Actions workflow to trigger weekly releases every Monday at 7:00 AM UTC by updating the build timestamp in bundle.konflux.Dockerfile. This ensures regular releases even when there are no operator code changes.

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[openshift-ci]

@AnnaZivkovic: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/bundle	f2c583b	link	true	/test bundle

Full PR test history. Your PR dashboard.

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