[ci] Start testing dune-grid as well
dune-grid contains the grid interface wrapper for dune-uggrid. Hence, they always should be compatible. dune-grid is the downstream modules. With this MR we will test build and test dune-grid after dune-uggrid.
Unfortunately, we cannot use the master.yml include anymore because we have different script parameters.
Fixes #48 (closed)
Edited by Timo Koch