FilesystemExporter does not gracefully handle exporting multiple times
The move to GHA exposed this bug (not sure how it wasn't an issue in Travis but I was able to reproduce locally).
If there are pre-existing files in the location that FileSystem attempts to export to you get a FileExistsError. This is common in the case where you're exporting multiple times.
Some potential solutions:
- Check that the directory is empty before exporting. Maybe even refuse to export but have a --force flag that will remove files in this directory.
- Ignore file exists errors either silently or raise a warning.
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