Thank you very much for this project. It's been very useful to me.

I noticed that nodejs14.x isn't supported. How can I add it? I found these instructions in the readme:

By tarring the full filesystem in Lambda, uploading that to S3, and then piping into Docker to create a new image from scratch – then creating mock modules that will be required/included in place of the actual native modules that communicate with the real Lambda coordinating services. Only the native modules are mocked out – the actual parent JS/PY/Java runner files are left alone, so their behaviors don't need to be replicated (like the overriding of console.log, and custom defined properties like callbackWaitsForEmptyEventLoop)

I think I understand the main steps, but I won't have the permission to upload the filesystem snapshot to lambci's s3 bucket for example. How can external collaborators contribute a new image?