Ci optimization (#330) #1294

Job	Run time
download_caravel	1m 38s
download_deps (pdk-with-volare)	3m 1s
download_deps (install_mcw)	4m 43s
download_deps (openlane)	53s
download_deps (setup-timing-scripts)	51s
download_deps (precheck)	2m 20s
hardening (sky130A)	1h 28m 42s
RTL-verification (sky130A)	5m 14s
hardening (sky130B)	1h 17m 22s
RTL-verification (sky130B)	5m 3s
STA (sky130A)	8m 10s
precheck (sky130A)	36m 58s
precheck (sky130B)	25m 27s
	4h 20m 22s

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