Ioss fix filesystem type api

[gsjaardema]

The filesystem_type function was returing a string_view. However, on the mac system, the value that was being returned was on the stack and left a dangling reference. Changed the api to return a std::string instead.

This function probably isn't being used much or at all yet, so should not break anyone to change the public api; alternative is to depreacate this function and add a new good function, but it seems like overkill, but am also ok if that is the approach that is desired.

[gsjaardema]

I guess this probably shouldn't be pushed since it contains more commits than just the fix to the filesystem api...
Most of the other changes are probably good except for the change to use my account on the docker push...

Forgot that my clone had some changes relative to sandialabs/seacas...