fix: source `tsch` environment file from anywhere #87

Job	Run time
get_datasets	12s
groovy_vs_cpp (pass1/rga_fa18_inbending)	28m 53s
groovy_vs_cpp (pass1/rga_fa18_outbending)	32m 12s
groovy_vs_cpp (pass1/rga_sp19)	21m 3s
groovy_vs_cpp (pass1/rgb_fa19)	20m 59s
groovy_vs_cpp (pass1/rgb_sp19)	43m 31s
groovy_vs_cpp (pass1/rgb_wi20)	31m 28s
groovy_vs_cpp (pass1/rgk_fa18_6.5GeV)	18m 57s
groovy_vs_cpp (pass1/rgk_fa18_7.5GeV)	24m 59s
groovy_vs_cpp (pass1/rgm_fa21)	1h 29m 13s
report	1s
	5h 11m 28s

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