Siddarth Kumar c4e0dbeae7 ci: serialise linux and macos jobs and build from system nim ...

- in linux jobs we serialise `tests-ui`, `tests-nim` and  appImage
`package` into a single workflow.
- in macos job we serialise `iOS`, `MacOS` builds into a single
workflow.
- we use system `nim` for all jobs and dont have to build nim from
nimbus build system each time.
  - installed `nim 2.2.10` on `windows` and `macos` hosts.
  - upgraded nim in Docker images and bumped the harbour tags for
`linux` and `android`.

This will help us avoid checkout and `deps` stage for these jobs and we
can free up slots for other jobs.
This way we can do more work in parallel.

Because of this we save:
- `12` minutes of build time in `linux` job.
- `10` minutes of build time in `macos` job.
- `21` minutes of `nim` compile time in `windows` job.

2026-08-26 15:41:03 +05:30

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Dockerfile

ci: serialise linux and macos jobs and build from system nim

2026-08-26 15:41:03 +05:30