Add nightly conda job to test top-level build with bleeding-edge requirements
This MR introduces a nightly top-level build job using conda. The conda requirements are unpinned, allowing us to test this project against the latest releases of upstream requirements, e.g. hdf5.
Currently the conda build fails, so I've marked it as
API Changes and Justification
Backwards Compatible Changes
- This change introduces no API changes
- This change adds new API calls
Backwards Incompatible Changes
- This change modifies an existing API
- This change removes an existing API
If any of the Backwards Incompatible check boxes are ticked please provide a justification why this change is necessary and why it needs to be done in a backwards incompatible way.