add darshan log file from github CI when using openMPI

[wkliao]

File MPI_File_write.darshan_log was generated by GitHub CI, which
used the following commands.

darshan-config
  --log-hints       -> cb_nodes=4

CMD=/usr/bin/mpiexec --oversubscribe -n 4 ./tst_mpi_io ./testfile.dat

ls -lt /home/runner/work/darshan/darshan/darshan_logs/2025/8/11
total 4
-r-------- 1 runner docker 3181 Aug 11 15:32 runner_tst_mpi_io_id14869-14869_8-11-55935-8583482323186166128_1.darshan

DARSGAN_PARSER=/home/runner/work/darshan/darshan/darshan_install/bin/darshan-parser

Error: Z_DATA_ERROR
Error: unable to inflate darshan log data.
Error: failed to read name hash from darshan log file.