is there a way to instruct pulumi on how it can pack a lambda function built with Rust? the doc states

Any of the supported Lambda runtimes can be used, including Node.js (as shown here), Python, Ruby, Java, Go, and .NET.

But I don't see any mention about custom provided runtimes

You need to set the runtime to be

provided

or

provided.al2

cool, but is there any way to instruct pulumi how to pack a lambda with a rust runtime? I need to build and compile it before zipping it

You could use the command provider: https://www.pulumi.com/registry/packages/command/ to run the necessary commands

that's neat, thanks!