feat: store env in YAML

[NotNotARobot]

Pull Request Summary

It is considered best practice to store constant variables in the YAML context, rather than the bash context. This reduces the overhead on the machines, and makes them more robust against potential attacks.

Check list

• [-] added or updated unit tests
• [-] updated Astar official documentation
• [-] added OnRuntimeUpgrade hook for precompile revert code registration
• [-] added benchmarks & weights for any modified runtime logics.

[Dinonard]

Thank you for the PR, but to use your quote, we've learned that not accepting minor/irrelevant updates from unknown contributors is more robust against potential attacks 🙂.