Can add one or more files using the for_each meta-argument on gitlabcommits_fileresource.

As of writing there is one pull request for adding file resource for the offical Gitlab terraform provider, but is has a limitation of only being able to add one file at a time or set -parallelism=1. This provider collects create, update and delete actions and commits all changes in one commit.

The provider will halt one resource in order to not be exited by Terraform. This results in possible error messages being displayed for that specific resource while the error might be for another resource in the for_each collection.

This issue is also due to the resource halting. The resources that is not halted by the provider will display that they were applied, but this might be incorrect if the commit failed. This will hopefully be corrected when a read/plan is executed.