CI Build Job `arm-05` (runtime 2 hours) has become the Performance Bottleneck for CI Workflow. That's because `arm-05` builds too many targets for nRF, RP2040, SAM 3, SAM A and SAM D. This PR splits `arm-05` into multiple smaller jobs, to reduce the CI Build Duration.
Before the PR: `arm-05` is overloaded, build requires 2 hours
- `arm-05` (2 hours): nRF, RP2040, SAM 3, SAM A, SAM D
- `arm-06` (56 mins): STM32 [a-m]*
After the PR: `arm-05` is offloaded (to `arm-06` and `arm-07`), completes within 1 hour
- `arm-05` (47 mins): nRF
- `arm-06` (1 hour): Reserve for RP2040 exclusively
- `arm-07` (1 hour 15 mins): SAM 3, SAM A, SAM D, STM32 [a-m]*
Build Jobs are sorted by Target Name. So we cascade the changes and rename the Build Jobs: `arm-07` becomes `arm-08`, `arm-08` becomes `arm-09` etc. Then `arm-13` becomes a new job `arm-14`. (Which we added to `build.yml`)
Performance of `arm-05` is discussed in https://github.com/apache/nuttx/issues/13775 and https://github.com/apache/nuttx/issues/12773
Lup Yuen Lee