Offer an all-in-one container image for easier testing and demonstration

### Current Behavior

Hyades consists of multiple services, each of which are currently distributed as individual container images:

* PostgreSQL
* API server
* Frontend

While this provides deployment flexibility, it makes it harder to quickly get something up-and-running.

Users wishing to build and test integrations with the system would benefit from having a single container instead, which they then can integrate with testcontainers.

For demonstration purposes, spinning up a single container is much more straightforward than having to setup a Docker Compose or Minikube environment.

### Proposed Behavior

Provide a container image that contains all necessary services.

The services should be configured with a minimal resource footprint, such that the container can be run in CI environments, and normal laptops.

Starting the image without additional configuration should "just work".

The image **must not** contain any software that is licensed under non-OSI compliant licenses.

It needs to be made clear that the image is not intended for production use.

### Checklist

- [X] I have read and understand the [contributing guidelines](https://github.com/DependencyTrack/hyades/blob/main/CONTRIBUTING.md#filing-issues)
- [X] I have checked the [existing issues](https://github.com/DependencyTrack/hyades/issues) for whether this enhancement was already requested