supabase / supabase-flutter / 31590907293
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chore(ci): use Blacksmith macOS runners (#1688)

Moves every macOS CI job from GitHub-hosted `macos-latest` to
`blacksmith-6vcpu-macos-latest`, mirroring supabase/supabase-swift#1185.

## Jobs migrated

- `.github/workflows/build.yml`: `Build macos`, `Build ios`
- `.github/workflows/test.yml`: `Flutter v3.35.x on macos-latest`,
`Flutter Latest on macos-latest`
- `.github/workflows/example-integration-tests.yml`: `macos`, `ios`

Ubuntu and Windows jobs are untouched.

## Implementation note

In `build.yml` and `test.yml` the `os` matrix key feeds both the job
display name and several step conditions, so a separate `runner` key was
added and `runs-on` points at that instead. Job names stay
byte-identical, so required status checks in branch protection keep
matching. `example-integration-tests.yml` only conditions on
`matrix.target`, so its `os` value was swapped directly.

A `.github/actionlint.yaml` registers the Blacksmith label, since
actionlint cannot discover labels that come from a GitHub App and would
otherwise flag every `runs-on` here.

## Measured effect

Median duration of the GitHub-hosted jobs over the last two days of
runs, against this branch's first run:

| Job | GitHub-hosted (median) | Blacksmith | Change |
| --- | --- | --- | --- |
| `Build macos` | 237s | 123s | 1.9x faster |
| `Build ios` | 232s | 125s | 1.9x faster |
| `Flutter v3.35.x on macos` | 156s | 88s | 1.8x faster |
| `Flutter Latest on macos` | 183s | 93s | 2.0x faster |

Queue time went up slightly, from 2 to 4 seconds to 13 to 22 seconds,
which the runtime saving absorbs several times over.

## Still unexercised

`Example integration tests` is gated behind a release title or the
`integration tests` label, so the `macos` and `ios` simulator jobs did
not run here. Those boot a simulator with `xcrun simctl erase`/`boot`,
which is the most likely step to behave differently on a Blacksmith
image, so the label is worth applying once before merge.

Closes SDK-1466


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Jobs
ID Job ID Ran Files Coverage
1 yet_another_json_isolate - 31590907293.1 1
94.44
 GitHub Action Run
2 functions_client - 31590907293.2 3
98.86
 GitHub Action Run
3 supabase_common - 31590907293.3 13
99.32
 GitHub Action Run
4 supabase - 31590907293.4 13
87.19
 GitHub Action Run
5 gotrue - 31590907293.5 27
88.51
 GitHub Action Run
6 storage_client - 31590907293.6 13
84.53
 GitHub Action Run
7 realtime_client - 31590907293.7 11
90.43
 GitHub Action Run
8 postgrest - 31590907293.8 10
85.71
 GitHub Action Run
9 supabase_flutter - 31590907293.9 10
81.41
 GitHub Action Run
Source Files on build 31590907293