cli: Manual deployment hangs with a deployment folder that starts with a dot

Describe the bug

Executing ‘netlify deploy -d .build’ does not find any files, and hangs during the upload.

Here is the output of a tried deployment:

Deploying to draft URL...
✔ Finished hashing 0 files
✔ CDN requesting 0 files
✔ Finished uploading 0 assets
⧇ Waiting for deploy to go live...

You see, no files were found (even so there are files).

To Reproduce

Steps to reproduce the behavior:

1. Setup a Netlify project
2. on Linux, create a hidden directory (a directory that starts with a dot, i.e. “.deploy”)
3. Put some HTML files into the hidden directory
4. Start the deployment of the hidden folder

Configuration

• If possible, please copy/paste below your netlify.toml.

I’m using the default netlify.toml (I didn’t change anything).

• Please enter the following command in a terminal and copy/paste its output:

  System:
    OS: Linux 5.8 Arch Linux
    CPU: (8) x64 Intel(R) Core(TM) i7-4710MQ CPU @ 2.50GHz
    Memory: 1.96 GB / 15.52 GB
    Container: Yes
    Shell: 5.0.18 - /bin/bash
  Binaries:
    Node: 14.10.1 - /usr/bin/node
    npm: 6.14.8 - /usr/bin/npm
    Watchman: 4.9.0 - /usr/bin/watchman
  npmGlobalPackages:
    netlify-cli: 2.61.2

Expected behavior

The CLI finds files in the deployment folder, and the upload succeeds (at least, if there is a problem, there should be an error message)

CLI Output

See above

Additional context

After changing the name of the deployment folder from “.build” to “build”, everything works as expected