A module like Social Registry, PBMS, or SPAR is offered as a Helm Chart package.
Refer to the packaging hierarchy here:
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At the highest level a package is synonymous to a Helm chart that collates all dependencies into a near "single-click" installation. This "Module Package Helm Chart" contains several other dependent charts. Each Helm chart typically contains one Docker (there may be more, but for simplicity let's consider a single Docker per Helm). A Docker is a package in itself that may contain code from several Git repositories. A single Git repository may house multiple components like Odoo modules, FastAPI modules etc.
Helm chart contain Dockers for various components. The Dockers for top-level modules like Social Regsitry, PBMS, are created with a Docker package file. Learn more about packaging and uploading such Dockers in the following guides: