Watch a directory with archive_file (don't do this)

archive_example.tf

data "archive_file" "lambda_source" {
  type        = "zip"
  source_dir  = "${path.module}/lambdas/mylambda/"
  output_path = "lambda_source.zip"
}

resource "null_resource" "lambda_deploy" {
  triggers = {
    lambda_hash = "${data.archive_file.lambda_source.output_sha}"
  }

  provisioner "local-exec" {
    # deploy code
    # probably upload lambda code to S3
  }
}