ci: a runs-on input names the sealed job's runner

.github/workflows/ci.yml

@@ -38,14 +38,20 @@ on:
         description: Crate directory.
         type: string
         default: "."
+      runs-on:
+        description: >-
+          The runner label of the sealed job; a caller on self-hosted runners
+          passes its own, for example from an organization variable.
+        type: string
+        default: ubuntu-latest
 
 permissions:
   contents: read
 
 jobs:
   sealed:
     name: sealed lint, test, cross-check, msrv
-    runs-on: ubuntu-latest
+    runs-on: ${{ inputs.runs-on }}
     steps:
       - uses: actions/checkout@v7.0.1
 

CHANGELOG.md

@@ -7,6 +7,7 @@ The format follows [Keep a Changelog](https://keepachangelog.com); releases are
 
 ### Added
 
+- `ci.yml`: `runs-on` names the runner of the sealed job (default `ubuntu-latest`), so a caller on self-hosted runners passes its label, for example `${{ vars.RUNNER_STANDARD || 'ubuntu-latest' }}`.
 - `rust-cache`: `cache-registry` (`"true"`, `"false"`, `"auto"`); `auto` skips the registry archive, restore and save alike, when `RUST_CI_CRATES_MIRROR` is set in the job environment, and the `registry-cached` output says what happened.
 - `sccache`: `namespace` puts a job's objects below the configured backend's key prefix (S3, GCS, Azure, WebDAV, Redis, Memcached, OSS, COS, or a subdirectory of `SCCACHE_DIR`), so tiers or platforms share one backend without sharing objects; it separates objects, not writers.
 - `route-git-token`: `remaps`, lines of `from=to` that fetch a dependency pinned at a URL outside the routed namespace from a repository on the host, with the token presented.

README.md

@@ -68,6 +68,7 @@ jobs:
 | `features` | `""` | Feature flag for the sealed lint-and-test leg. |
 | `msrv` | `true` | Also verify the crate on its declared MSRV; skipped when `rust-version` is `msrv`. |
 | `working-directory` | `.` | Crate directory. |
+| `runs-on` | `ubuntu-latest` | The runner of the sealed job; a caller on self-hosted runners passes its label. |
 
 ## Actions