test: add //sram:top_mix local build #790

Job	Run time
Generate configs	11s
Lint Bazel files	3s
open //sram:top_mix	5m 55s
//sram:top_mix_grt	3m 21s
Local flow - clean setup	8m 30s
open tag_array_64x184	4m 14s
tag_array_64x184_generate_abstract	3m 42s
open L1MetadataArray	7m 46s
tag_array_64x184_report	2m 26s
open subpackage:L1MetadataArray	9m 8s
lb_32x128_generate_abstract	4m 32s
open subpackage:tag_array_64x184	5m 52s
lb_32x128_test_generate_abstract	2m 20s
L1MetadataArray_generate_abstract	5m 0s
data_2048x8_generate_abstract	2m 32s
regfile_128x65_floorplan	2m 17s
subpackage:L1MetadataArray_generate_abstract	4m 59s
subpackage:tag_array_64x184_generate_abstract	2m 15s
Local flow - preinstalled orfs	7m 24s
	1h 22m 27s

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