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CI: fork PRs run their Linux jobs on the isolated self-hosted runners (#2249)

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Fork PRs were waiting hours for GitHub's shared runners. Their Linux
jobs (checks, Clippy, Build tests, the test shards, Doc tests, Reference
tests) now run on the ephemeral, network-jailed self-hosted-untrusted
runners, without the trusted runners' warm build directories.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
bherbruckandClaude Opus 5.5 authored and GitHub committed 2026-10-17 19:27:13 -04:00
1 parent dc8edead22
commit e48e553758
1 file changed
+12 -11
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.github/workflows/ci.yml
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@@ -20,7 +20,8 @@
# There, Select checks and ci run on the self-hosted light runner (`self-hosted-light`, quick
# jobs, so they never wait behind a build), and the repository checks, Clippy, the doc tests,
# the reference tests and test shards 1-2 on the self-hosted runners (`self-hosted-fast`, warm
# build directories via scripts/ci/warm-target.sh); everything else runs on GitHub's runners.
# build directories via scripts/ci/warm-target.sh). Fork PRs' Linux jobs run on the isolated, ephemeral
# `self-hosted-untrusted` runners (no warm caches); everything else runs on GitHub's runners.
# The test archive is always built on GitHub's runners: the self-hosted machine has a newer
# glibc, so its binaries wouldn't start on ubuntu-24.04, while the archive runs there unchanged
# (same /home/runner/work checkout path). Fork pull requests, the nightly run and Run workflow
@@ -170,12 +171,12 @@ jobs:
checks:
name: Format and repository checks
runs-on: ${{ (github.event_name == 'merge_group' || (github.event_name == 'push' && github.ref == 'refs/heads/main') || (github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository)) && 'self-hosted-fast' || 'ubuntu-24.04' }}
runs-on: ${{ (github.event_name == 'merge_group' || (github.event_name == 'push' && github.ref == 'refs/heads/main') || (github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository)) && 'self-hosted-fast' || ((github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository) && 'self-hosted-untrusted' || 'ubuntu-24.04') }}
timeout-minutes: 15
steps:
- uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
- name: Warm build directory (self-hosted runner)
if: runner.environment == 'self-hosted'
if: runner.environment == 'self-hosted' && !(github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository)
run: scripts/ci/warm-target.sh checks
- uses: dtolnay/rust-toolchain@stable
with:
@@ -207,12 +208,12 @@ jobs:
name: Native Linux Clippy
needs: changes
if: needs.changes.outputs.native == 'true'
runs-on: ${{ needs.changes.outputs.local == 'true' && 'self-hosted-fast' || 'ubuntu-24.04' }}
runs-on: ${{ needs.changes.outputs.local == 'true' && 'self-hosted-fast' || ((github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository) && 'self-hosted-untrusted' || 'ubuntu-24.04') }}
timeout-minutes: 30
steps:
- uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
- name: Warm build directory (self-hosted runner)
if: runner.environment == 'self-hosted'
if: runner.environment == 'self-hosted' && !(github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository)
run: scripts/ci/warm-target.sh clippy
- uses: dtolnay/rust-toolchain@stable
with:
@@ -237,7 +238,7 @@ jobs:
name: Build tests
needs: changes
if: needs.changes.outputs.native == 'true'
runs-on: ubuntu-24.04
runs-on: ${{ (github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository) && 'self-hosted-untrusted' || 'ubuntu-24.04' }}
timeout-minutes: 45
env:
CARGO_INCREMENTAL: "0"
@@ -280,7 +281,7 @@ jobs:
tests:
name: Native Linux tests (${{ matrix.shard }}/4)
needs: [changes, build-tests]
runs-on: ${{ (needs.changes.outputs.local == 'true' && matrix.shard <= 2) && 'self-hosted-fast' || 'ubuntu-24.04' }}
runs-on: ${{ (needs.changes.outputs.local == 'true' && matrix.shard <= 2) && 'self-hosted-fast' || ((github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository) && 'self-hosted-untrusted' || 'ubuntu-24.04') }}
timeout-minutes: 60
strategy:
fail-fast: false
@@ -436,7 +437,7 @@ jobs:
name: Doc tests
needs: changes
if: needs.changes.outputs.native == 'true'
runs-on: ${{ needs.changes.outputs.local == 'true' && 'self-hosted-fast' || 'ubuntu-24.04' }}
runs-on: ${{ needs.changes.outputs.local == 'true' && 'self-hosted-fast' || ((github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository) && 'self-hosted-untrusted' || 'ubuntu-24.04') }}
timeout-minutes: 45
env:
CARGO_INCREMENTAL: "0"
@@ -446,7 +447,7 @@ jobs:
steps:
- uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
- name: Warm build directory (self-hosted runner)
if: runner.environment == 'self-hosted'
if: runner.environment == 'self-hosted' && !(github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository)
run: scripts/ci/warm-target.sh doc-tests
- uses: dtolnay/rust-toolchain@stable
# The self-hosted runner keeps its build directory and Cargo home instead.
@@ -486,7 +487,7 @@ jobs:
name: Reference tests
needs: changes
if: needs.changes.outputs.oracle == 'true'
runs-on: ${{ needs.changes.outputs.local == 'true' && 'self-hosted-fast' || 'ubuntu-24.04' }}
runs-on: ${{ needs.changes.outputs.local == 'true' && 'self-hosted-fast' || ((github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository) && 'self-hosted-untrusted' || 'ubuntu-24.04') }}
timeout-minutes: 60
env:
CARGO_INCREMENTAL: "0"
@@ -496,7 +497,7 @@ jobs:
steps:
- uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
- name: Warm build directory (self-hosted runner)
if: runner.environment == 'self-hosted'
if: runner.environment == 'self-hosted' && !(github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository)
run: scripts/ci/warm-target.sh oracle
- uses: dtolnay/rust-toolchain@stable
# The self-hosted runner keeps its build directory and Cargo home instead.