26b9782d8b CI: Re-write run_task.sh (Tobin C. Harding)
Pull request description:
Recently we re-wrote CI to increase VM level parallelism, in hindsite this has proved to be not that great because:
- It resulted in approx 180 jobs
- We are on free tier so only get 20 jobs (VMs) at a time so its slow to run
- The UI is annoying to dig through the long job list to find failures
Have another go at organising the jobs with the main aim of shortening total run time and making it easier to quickly see fails.
Re-write the `run_task.sh` script, notable moving manifest handling to the workflow. Also don't bother testing with beta toolchain.
### Note on review
The diff is hard to read for `rust.yml`, I tried splitting out a bunch of separate patches but it resulted in the same thing (because there are so many identical lines in the yaml file). I suggest just looking at the yaml file and not the diff.
ACKs for top commit:
apoelstra:
ACK 26b9782d8b
sanket1729:
ACK 26b9782d8b.
Tree-SHA512: 1b0a0bab5cf729c5890f7150953499b42aebd3b1c31a1b0d3dfa5b5e78fda11e17a62a2df6b610ab4a950d5709f3af6fff1ae64d9e67379338903497ab77ae0e
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