ENH: Get dockerfile if running workflow on an older version #1

Job	Run time
build-all-debug-single	3m 9s
build-postlib-release	9m 41s
build-drivers-release	5m 15s
build-all-debug	4m 59s
build-test-uadriver-debug	2m 31s
rtest-modules-debug	4m 50s
rtest-module-drivers	2m 40s
build-openfast-release	4m 21s
build-fastfarm-release	9m 21s
build-interfaces-release	9m 23s
rtest-OF-5MW_OC4Semi_WSt_WavesWN	2m 12s
rtest-OF-5MW_Land_BD_DLL_WTurb	4m 14s
rtest-OF	4m 53s
rtest-OF-5MW_OC3Mnpl_DLL_WTurb_WavesIrr	3m 7s
rtest-OF-5MW_OC3Trpd_DLL_WSt_WavesReg	4m 28s
rtest-OF-5MW_OC4Jckt_DLL_WTurb_WavesIrr_MGrowth	1m 1s
rtest-OF-linearization	3m 32s
rtest-FF	1s
rtest-interfaces	1s
	1h 19m 39s

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