Revert "CI: add testing step and remove OTB_DATA_ROOT"
Revert "CI: add testing step and remove OTB_DATA_ROOT"

This reverts commit e60d91f5d6973e53a09fbaa9c581b528eb921f05.

orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB