CI: scale fork timeouts to the runner a fork actually gets

.github/workflows/ci.yaml

@@ -347,7 +347,12 @@ jobs:
     runs-on: ${{ github.repository == 'astral-sh/ruff' && 'depot-ubuntu-22.04-16' || 'ubuntu-latest' }}
     needs: determine_changes
     if: ${{ !contains(github.event.pull_request.labels.*.name, 'no-test') && (needs.determine_changes.outputs.code == 'true' || github.ref == 'refs/heads/main') }}
-    timeout-minutes: 20
+    # The runner above is chosen per repository; the budget must be too. A fork
+    # drops from the 16-core Depot machine to `ubuntu-latest` and keeps a limit
+    # calibrated for the larger one, so the job is killed mid-build every time.
+    # 40 rather than a guess: this job measured 22m04s on a fork runner once it
+    # was allowed to finish, so the fork budget is ~1.8x its observed cost.
+    timeout-minutes: ${{ github.repository == 'astral-sh/ruff' && 20 || 40 }}
     env:
       # Line-tables-only debug info: faster builds, backtraces still work.
       CARGO_PROFILE_DEV_DEBUG: line-tables-only
@@ -453,7 +458,10 @@ jobs:
     runs-on: ${{ matrix.platform }}
     needs: determine_changes
     if: ${{ !contains(github.event.pull_request.labels.*.name, 'no-test') && (needs.determine_changes.outputs.code == 'true' || github.ref == 'refs/heads/main') }}
-    timeout-minutes: 20
+    # Same reason as `cargo-test-linux`: the matrix above already picks a
+    # smaller runner for forks, so the budget has to follow it. Measured on a
+    # fork: 24m36s on windows-latest, 14m45s on macos-latest.
+    timeout-minutes: ${{ github.repository == 'astral-sh/ruff' && 20 || 40 }}
     env:
       # Line-tables-only debug info: faster builds, backtraces still work.
       CARGO_PROFILE_DEV_DEBUG: line-tables-only
@@ -681,7 +689,11 @@ jobs:
         needs.determine_changes.outputs.linter == 'true' ||
         needs.determine_changes.outputs.formatter == 'true'
       )
-    timeout-minutes: 20
+    # Same split as the `cargo test` jobs: 8-core Depot upstream, `ubuntu-latest`
+    # on a fork, one budget for both. It was cancelled at 20m27s on the run that
+    # proved the others, so >20 is measured; how much more is not, hence the
+    # deliberately loose 45.
+    timeout-minutes: ${{ github.repository == 'astral-sh/ruff' && 20 || 45 }}
     env:
       # Line-tables-only debug info: faster builds, backtraces still work.
       CARGO_PROFILE_DEV_DEBUG: line-tables-only
@@ -799,7 +811,8 @@ jobs:
       - determine_changes
     # Only runs on pull requests, since that is the only we way we can find the base version for comparison.
     if: ${{ !contains(github.event.pull_request.labels.*.name, 'no-test') && github.event_name == 'pull_request' && (needs.determine_changes.outputs.ty == 'true' || needs.determine_changes.outputs.py-fuzzer == 'true') }}
-    timeout-minutes: ${{ github.repository == 'astral-sh/ruff' && 10 || 20 }}
+    # Fork budget measured, not guessed: 15m14s on `ubuntu-latest`.
+    timeout-minutes: ${{ github.repository == 'astral-sh/ruff' && 10 || 30 }}
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:

.github/workflows/ty-ecosystem-analyzer.yaml

@@ -53,7 +53,11 @@ jobs:
       matrix:
         revision: [base, pr]
     runs-on: ${{ github.repository == 'astral-sh/ruff' && 'depot-ubuntu-22.04-32' || 'ubuntu-latest' }}
-    timeout-minutes: 5
+    # The widest gap in the repository: upstream builds on a 32-core Depot
+    # machine, a fork on `ubuntu-latest`, and both were given five minutes.
+    # A fork build measured 5m34s with a warm `rust-cache`; 25 leaves room for
+    # a cold one, which is the case the five-minute limit could never survive.
+    timeout-minutes: ${{ github.repository == 'astral-sh/ruff' && 5 || 25 }}
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with: