[FEATURE REQUEST] Network connection test

[MTDouglas]

Is this feature for general SeqSender usage or for submitting to a specific database, if so what database?

General SeqSender.

Is your feature request related to a problem? If so please describe.

I am trying to use SeqSender (using singularity) but I am getting the following error:
`Creating submission files for BIOSAMPLE
Files are stored at: /seqsender_test/test_submission/initial_test/submission_files/BIOSAMPLE
Creating submission files for GENBANK
Files are stored at: /seqsender_test/test_submission/initial_test/submission_files/GENBANK

Uploading sample files to NCBI-BIOSAMPLE, as a 'TEST' submission. If this is not intended, interrupt immediately.

Error:[Errno 101] Network is unreachable`
I've been trying to debug if the issue lies within the container itself or my system and can't quite figure out which one it is.

Describe the solution you'd like

Having some more clear error handling for this network connectivity issue would be helpful to figure out if it's coming from SeqSender itself or with my own network settings.