Read gas from config #15215

Job	Run time
regression (ubuntu-latest, ocaml-variants.4.14.2+options,ocaml-option-flambda)	3m 55s
regression (macos-latest, ocaml-variants.4.14.2+options,ocaml-option-flambda)	6m 16s
extraction	0s
	10m 11s

Provide feedback