Recommended Way for less Gateway Setup in Ephemeral Containers

Right now, I use Intellij Gateway via my GitHub Codespaces and enjoy it. However, there is quite a bit of boot-strapping needed to get setup ie.

• Gateway needs to download an IDE on the CodeSpaces
• I need to manually install all my plug-ins
• I need to manually set-up configuration(memory)

What is the recommended way to just put this all into a base container so when I start a new codespace environment, everything is good to go?

Thanks