Apply the shared variable file pattern to the newWorkload example

[brooke-hamilton]

Benefit/Result/Outcome

So that all examples are consistent in how they gather state data from the main MLZ deployment.

Description

The shared variable pattern was used in the container registry example. Apply the same pattern to the new workload.

Acceptance Criteria

• The Bicep file for the new workload example uses the shared variable pattern
• The readme document is updated to include instructions for using the pattern
• The readme file in the examples folder contains a brief explanation of the pattern and a link to the docs.microsoft.com article
• Add a reference and example to the shared variable pattern to the Bicep deployment instructions readme.
• Ensure that the build pipeline is updated to work with this example.