build.plat: add build_{{name}}.json output [0.5 backport]
#3751
| Job | Run time |
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| 45s | |
| 46s | |
| 39s | |
| 49s | |
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| 6m 38s | |
| 3m 28s | |
| 4m 1s | |
| 4m 38s | |
| 2m 39s | |
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| 6m 23s | |
| 5m 55s | |
| 5m 32s | |
| 3m 19s | |
| 7s | |
| 0s | |
| 2s | |
| 12s | |
| 8s | |
| -1s | |
| 49m 46s |