Leaf Node Credentials File regex dies on CRLF file endings

[Madgvox]

Observed behavior

When attempting to read a .creds file with CRLF line endings via a leaf node config, nats-server dies with a LeafNode Remote Credentials file "..." malformed error.

Looks like this was an issue in another area of the code years ago (https://github.com/nats-io/jwt/pull/72/files), but this one is due to a different regex that doesn't have that fix:

nats-server/server/leafnode.go

Line 799 in 1a4fec8

var credsRe = regexp.MustCompile(`\s*(?:(?:[-]{3,}[^\n]*[-]{3,}\n)(.+)(?:\n\s*[-]{3,}[^\n]*[-]{3,}\n))`)

Expected behavior

The nats-server executable should be able to parse CRLF line endings.

Server and client version

nats-server: v2.10.22

Host environment

Windows 11

Steps to reproduce

1. Create a *.creds file with CRLF line endings.
2. Specify that creds file in a leaf.conf file. Mine looked like this:

leafnodes {
  remotes = [
    {
     url: "tls://connect.ngs.global"
     credentials: "..."
    },
  ]
}

3. Start the server and observe the error: LeafNode Remote Credentials file "..." malformed

[aricart]

@Madgvox thank you for the report and the tracking.