ci: automatically get list of datasets to check #81

Job	Run time
get_datasets	8s
groovy_vs_cpp (pass1/rga_fa18_inbending)	31m 57s
groovy_vs_cpp (pass1/rga_fa18_outbending)	44m 23s
groovy_vs_cpp (pass1/rga_sp19)	23m 58s
groovy_vs_cpp (pass1/rgb_fa19)	30m 37s
groovy_vs_cpp (pass1/rgb_sp19)	52m 46s
groovy_vs_cpp (pass1/rgb_wi20)	35m 3s
groovy_vs_cpp (pass1/rgk_fa18_6.5GeV)	25m 18s
groovy_vs_cpp (pass1/rgk_fa18_7.5GeV)	33m 46s
report	1s
	4h 37m 57s

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