As a point of clarity, what you are attempting to persist is the data on your private Ganache network (not Truffle). Truffle is simply the framework that allows you to create a project and point to different networks, such as the main net, Ropsten, Ganache, etc.
What you are trying to do cannot be accomplished with tests, but rather should be done on the deployment side (in the
migrations folder of your Truffle project). The whole point of the test is to temporarily examine a piece of the code to confirm it works, not persist.
In order to achieve what you want done, you should perform the deployment you are attempting to perform in your
migrations/2_deploy_contract.js file. When your code is in there, simply run
truffle migrate, and your code will deploy on whichever network you are pointing to.
If you are trying to perform hundreds of transactions, you must either do it manually, or write a script (similar to what you are doing in your tests) that will interact with the blockchain network that you are on and perform the transactions. How you write it and what tools you use are up to you (
web3.py, etc.), but they will all lead to the same outcome.
Take a look at this article for advice on how to use
web3js to perform what you are attempting to do.