Following the Tanssi guides, before spawning the network, we need to build the specs for the container chains and the tanssi-node. Instead of running the build-spec script (See the Tanssi script), I've added code to handle this by parsing the network.toml file to extract values like chain_spec_path and the collator names from it in the pop up parachain functionality.

Considerations for my approach:

1- About how to triggering Tanssi logic: My current approach is to have a hardcoded value in the pop-cli crate (frontend), and trigger the logic automatically if the Zombienet file contains a tanssi-node. See: https://github.com/r0gue-io/pop-cli/pull/296/files#diff-676bc9da9a6a8b135164d15340c548a94dcad29b8cd784ebda6a9e3ef2313622R94

Another approach could be allowing users to explicitly specify it by using a flag, like pop up parachain --container-chain, to spawn the container-chain environment. Which approach do you think is better?

2- Handling collator injection: In the build-spec script, Tanssi manually injects collator names into pallet-invulnerables and includes a comment in the Zombienet file to update the script if changes are made in the .toml file (See here: https://github.com/moondance-labs/tanssi/blob/master/test/configs/zombieTanssi.json#L51). This is a bit tricky because if user changes the name of the collators it has to be manually changed.
My current approach parses all collators from the Zombienet config and only injects those whose names start with "Collator". Thoughts on this approach?