File exclusion in mkspiffs

[Bruno Kraychete da Costa]

Hello @igrr,

I started using mkspiffs (as part of PlatformIO) recently and hit a limitation in that mkspiffs doesn't seem to support file/folder exclusions other than a few hardcoded ones (.DS_Store, .git, etc). I went ahead and added support for adding exclusions (e.g.: -x *.h, to exclude all files with the .h extension). If you think this could be useful, I'd be happy to share my changes.

Let me know.

Thanks!

[Bruno Kraychete da Costa]

Hi @igrr, here's a gentle ping to see if there's interesting in this change.

Thanks!