Add PYSCF-AD backend to environment.yml #514

Job	Run time
setup	2s
generate-example (lode-linear)	3m 29s
generate-example (roy-gch)	3m 20s
generate-example (dos-align)	5m 59s
generate-example (lpr)	3m 8s
generate-example (batch-cp2k)	1m 46s
generate-example (gaas-map)	5m 41s
generate-example (pi-metad)	4m 26s
generate-example (sample-selection)	2m 4s
generate-example (thermostats)	2m 58s
generate-example (heat-capacity)	2m 27s
generate-example (periodic-hamiltonian)	6m 37s
generate-example (pi-mts-rpc)	6m 37s
generate-example (path-integrals)	1m 57s
build-and-publish	35s
	51m 6s

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