Ci optimization #1293

Job	Run time
download_caravel	1m 56s
download_deps (pdk-with-volare)	3m 33s
download_deps (install_mcw)	3m 53s
download_deps (openlane)	1m 7s
download_deps (setup-timing-scripts)	47s
download_deps (precheck)	1m 47s
RTL-verification (sky130A)	1s
RTL-verification (sky130B)	1s
hardening (sky130A)	13m 45s
hardening (sky130B)	1s
precheck (sky130A)	36m 59s
STA (sky130A)	13m 37s
precheck (sky130B)	24m 47s
	1h 42m 14s

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