[signing] Implement owner-stage signing #2859

Job	Run time
Lint (quick)	3m 17s
Run OTBN crypto tests	2m 51s
Run OTBN smoke Test	2m 31s
Airgapped build	13m 23s
Lint (slow)	13m 42s
Verible lint	1m 1s
Build Docker Containers	2m 42s
CW305's Bitstream	21m 50s
Build and test software	13m 5s
Verilated Earl Grey	1h 25m 20s
Verilated English Breakfast	7m 31s
Earl Grey for CW310 / Build bitstream	1h 11m 6s
Earl Grey for CW310 Hyperdebug / Build bitstream	1h 9m 26s
Earl Grey for CW340 / Build bitstream	1h 29m 26s
CW310 SiVal Tests / FPGA test	30m 56s
CW310 Manufacturing Tests / FPGA test	29m 7s
CW310 SiVal ROM_EXT Tests / FPGA test	33m 52s
CW310 ROM_EXT Tests / FPGA test	15m 15s
CW310 ROM Tests / FPGA test	26m 49s
CW310 ROM_EXT Tests / FPGA test	5m 0s
CW310 Test ROM Tests / FPGA test	6m 8s
Cache bitstreams to GCP	0s
CW340 ROM_EXT Tests / FPGA test	52s
CW340 ROM Tests / FPGA test	6m 13s
CW340 Manufacturing Tests / FPGA test	5m 44s
CW340 SiVal Tests / FPGA test	4m 26s
CW340 SiVal ROM_EXT Tests / FPGA test	48s
CW340 Test ROM Tests / FPGA test	53s
Verify FPGA jobs	30s
	9h 23m 44s

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