add mpich to dask #18

Job	Run time
debuntu (ubuntu/jammy, openmpi, mini)	6m 44s
debuntu (ubuntu/jammy, openmpi, all)	2m 49s
debuntu (ubuntu/jammy, openmpi, pdi)	2m 24s
debuntu (ubuntu/jammy, mpich, mini)	4m 2s
debuntu (ubuntu/jammy, mpich, all)	3m 53s
debuntu (ubuntu/jammy, mpich, pdi)	4m 1s
debuntu (ubuntu/rolling, openmpi, mini)	4m 18s
debuntu (ubuntu/rolling, openmpi, all)	4m 19s
debuntu (ubuntu/rolling, openmpi, pdi)	2m 39s
debuntu (ubuntu/rolling, mpich, mini)	3m 51s
debuntu (ubuntu/rolling, mpich, all)	4m 0s
debuntu (ubuntu/rolling, mpich, pdi)	2m 33s
debuntu (debian/oldstable, openmpi, mini)	3m 24s
debuntu (debian/oldstable, openmpi, all)	5m 11s
debuntu (debian/oldstable, openmpi, pdi)	3m 36s
debuntu (debian/oldstable, mpich, mini)	2m 56s
debuntu (debian/oldstable, mpich, all)	3m 22s
debuntu (debian/oldstable, mpich, pdi)	4m 0s
debuntu (debian/unstable, openmpi, mini)	2m 28s
debuntu (debian/unstable, openmpi, all)	2m 19s
debuntu (debian/unstable, openmpi, pdi)	3m 27s
debuntu (debian/unstable, mpich, mini)	3m 11s
debuntu (debian/unstable, mpich, all)	3m 40s
debuntu (debian/unstable, mpich, pdi)	2m 34s
	1h 25m 41s

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