sonix: move pre and post stages to public github runners

.github/workflows/github-release.yml

@@ -13,10 +13,12 @@ on:
  workflow_dispatch:
 
 jobs:
+ # NOTE: setup and release step runs on Github's ordinary runners while
+ # the build step runs on our own. This allows starting and finishing builds
+ # without being blocked on the self-hosted runners.
  setup:
  name: Setup
- runs-on: self-hosted
-
+ runs-on: ubuntu-24.04
  outputs:
  version_number: ${{ steps.vars.outputs.version_number }}
  matrix: ${{ steps.toolchain.outputs.matrix }}
@@ -111,7 +113,7 @@ jobs:
  retention-days: 90
  release:
  name: Upload release
- runs-on: self-hosted
+ runs-on: ubuntu-24.04
  needs:
  - setup
  - build-matrix