minimize example docker image size

[yarikoptic]

ATM it is whooping 1.13GB so takes time to download it. And then together with #24 it just becomes somewhat disappointing to wait to just get no sensible output.

[Remi-Gau]

OK things have gotten worse now

the image is based on neurodocker based build of FSL... and we now have a 15 Go image...

it'd be nice if neurodocker did not create image that crush my will to live

[yarikoptic]

I think the demo bids-app should be a bash script which does something basic and hopefully somewhat useful. Then base image could be literally a few MBs if that. Here is a starting point I thought to pursue at some point but never got to it: https://github.com/yarikoptic/bids-basher/

[Remi-Gau]

I like the idea BUT... this repo is also a template got help people get started, so it should at least contains the bids validator.

But I agree that it probably should not have FSL and conda and all the extra fluff the current one has, if only because it makes for a bad template.

Could probably look into how to make the base validator thinner: https://github.com/bids-apps/base_validator/blob/master/Dockerfile

[yarikoptic]

Is bids-validator a requirement for a bids-apps? Although might be a good idea IMHO isn't a requirement really - and in reality I see a lot of uses where people just explicitly disable validate for their fmriprep etc runs

[Remi-Gau]

https://bids-apps.neuroimaging.io/dev_faq/#is-it-mandatory-to-first-check-the-dataset-validity-using-the-bids-validator

However... If we want the example repo be an example of good practices, I think it should contain the validator.

Sure people can skip validation, but as an app developer I would then be able to say the behaviors / outputs are much less guaranteed if you skip validation.