Allow customization of which files to exclude during CustomMakeBuilder:CopySource

[komapa]

Describe your idea/feature/enhancement

Related to some of what I said in #3348

If your source tree has a lot of files, think golang vendor/ folder AND also node_modules, CustomMakeBuilder:CopySource is super slow to the point of not even completing in many minutes (not sure if just the way it copies is also inefficient?) The root folder was close to 500MB, so not a lot of storage but I guess a lot of files.

Proposal

It will be great if you can support reading .gitignore or allow for a .samignore file that will allow us to exclude large directories which are not needed for building but are naturally in the repo because of the project structure you might have in place.

Additional Details

Thank you!

[qingchm]

Also thanks for this ticket! We will be pulling it in for internal discussion!

[nthornton2010]

Yes please! My makefile being in the root causes sam build to take over 10 minutes to complete just because of node_modules.

[ksmoore17]

Would be a solution for #1755 and #2310 -> examples of this being caused by python's venv and node_modules and occurring for pip builder and npm builder

[torresxb1]

We have a few issues asking for a similar thing in ignore: or a .samignore file. Closing so that we can track here: aws/aws-lambda-builders#185

[github-actions]

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