[ci] Use alternative mechanisms to avoid github API file limits #3809

Job	Run time
Lint (quick)	3m 33s
Lint (slow)	11m 56s
Build documentation	5m 4s
Airgapped build	7m 54s
Verible lint	1m 7s
Build Docker Containers	2m 35s
CW305's Bitstream	24m 41s
Run OTBN crypto tests	21m 56s
Run OTBN smoke Test	2m 41s
Build and test software	15m 17s
Verilated Earl Grey	1h 20m 23s
Verilated English Breakfast	8m 24s
Earl Grey for CW310 / Build bitstream	1m 56s
Earl Grey for CW310 Hyperdebug / Build bitstream	1m 59s
Earl Grey for CW340 / Build bitstream	2m 4s
CW310 ROM_EXT Tests / FPGA test	8m 8s
CW310 SiVal ROM_EXT Tests / FPGA test	37m 25s
CW310 SiVal Tests / FPGA test	30m 0s
CW310 Manufacturing Tests / FPGA test	34m 12s
CW310 Test ROM Tests / FPGA test	5m 27s
CW310 ROM Tests / FPGA test	44m 31s
Cache bitstreams to GCP	0s
CW340 Manufacturing Tests / FPGA test	44m 37s
CW340 ROM_EXT Tests / FPGA test	7m 51s
CW340 SiVal Tests / FPGA test	19m 41s
CW340 Test ROM Tests / FPGA test	5m 24s
CW340 SiVal ROM_EXT Tests / FPGA test	3m 58s
CW340 ROM Tests / FPGA test	57s
Verify FPGA jobs	23s
	7h 14m 4s

Provide feedback