Refine Windows Dev Drive setup

Incorporate the uv Dev Drive setup pattern by remounting newly-created Dev Drive VHDs after filter changes, using the configured temp directory for Bazel repo contents cache, and moving Cargo target output onto the selected fast Windows drive while preserving the default target path on other platforms.

Co-authored-by: Codex <noreply@openai.com>

.github/actions/setup-bazel-ci/action.yml

@@ -64,7 +64,7 @@ runs:
         # because some Windows test launchers mis-handle MANIFEST paths there.
         $driveRoot = if ($env:DEV_DRIVE) { $env:DEV_DRIVE } elseif (Test-Path 'D:\') { 'D:' } else { 'C:' }
         $bazelOutputUserRoot = Join-Path $driveRoot 'b'
-        $repoContentsCache = Join-Path $env:RUNNER_TEMP "bazel-repo-contents-cache-$env:GITHUB_RUN_ID-$env:GITHUB_JOB"
+        $repoContentsCache = Join-Path $env:TEMP "bazel-repo-contents-cache-$env:GITHUB_RUN_ID-$env:GITHUB_JOB"
         "BAZEL_OUTPUT_USER_ROOT=$bazelOutputUserRoot" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
         "BAZEL_REPO_CONTENTS_CACHE=$repoContentsCache" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
 

.github/scripts/setup-dev-drive.ps1

@@ -44,6 +44,15 @@ if (Test-Path "D:\") {
 
         Invoke-BestEffort { fsutil devdrv trust $Drive } "Trusting Dev Drive $Drive"
         Invoke-BestEffort { fsutil devdrv enable /disallowAv } "Disabling AV filter attachment for Dev Drives"
+        try {
+            Dismount-VHD -Path $VhdPath
+            Mount-VHD -Path $VhdPath | Out-Null
+        } catch {
+            Write-Warning "Remounting Dev Drive $Drive failed: $($_.Exception.Message)"
+            if (-not (Test-Path "$Drive\")) {
+                throw
+            }
+        }
         Invoke-BestEffort { fsutil devdrv query $Drive } "Querying Dev Drive $Drive"
 
         Write-Output "Using Dev Drive at $Drive"
@@ -55,8 +64,12 @@ if (Test-Path "D:\") {
 $Tmp = "$Drive\codex-tmp"
 New-Item -Path $Tmp -ItemType Directory -Force | Out-Null
 
+$CargoTargetDir = "$Drive\codex-cargo-target"
+New-Item -Path $CargoTargetDir -ItemType Directory -Force | Out-Null
+
 @(
     "DEV_DRIVE=$Drive"
+    "CARGO_TARGET_DIR=$CargoTargetDir"
     "TMP=$Tmp"
     "TEMP=$Tmp"
 ) | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append

.github/workflows/rust-ci-full.yml

@@ -161,6 +161,7 @@ jobs:
       # mixed-architecture archives under sccache.
       USE_SCCACHE: ${{ (startsWith(matrix.runner, 'windows') || (matrix.runner == 'macos-15-xlarge' && matrix.target == 'x86_64-apple-darwin')) && 'false' || 'true' }}
       CARGO_INCREMENTAL: "0"
+      CARGO_TARGET_DIR: ${{ github.workspace }}/codex-rs/target
       SCCACHE_CACHE_SIZE: 10G
       # In rust-ci, representative release-profile checks use thin LTO for faster feedback.
       CARGO_PROFILE_RELEASE_LTO: ${{ matrix.profile == 'release' && 'thin' || 'fat' }}
@@ -470,7 +471,7 @@ jobs:
         uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
         with:
           name: cargo-timings-rust-ci-clippy-${{ matrix.target }}-${{ matrix.profile }}
-          path: codex-rs/target/**/cargo-timings/cargo-timing.html
+          path: ${{ env.CARGO_TARGET_DIR }}/**/cargo-timings/cargo-timing.html
           if-no-files-found: warn
 
       # Save caches explicitly; make non-fatal so cache packaging
@@ -541,6 +542,7 @@ jobs:
       # mixed-architecture archives under sccache.
       USE_SCCACHE: ${{ (startsWith(matrix.runner, 'windows') || (matrix.runner == 'macos-15-xlarge' && matrix.target == 'x86_64-apple-darwin')) && 'false' || 'true' }}
       CARGO_INCREMENTAL: "0"
+      CARGO_TARGET_DIR: ${{ github.workspace }}/codex-rs/target
       SCCACHE_CACHE_SIZE: 10G
 
     strategy:
@@ -701,7 +703,7 @@ jobs:
         uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
         with:
           name: cargo-timings-rust-ci-nextest-${{ matrix.target }}-${{ matrix.profile }}
-          path: codex-rs/target/**/cargo-timings/cargo-timing.html
+          path: ${{ env.CARGO_TARGET_DIR }}/**/cargo-timings/cargo-timing.html
           if-no-files-found: warn
 
       - name: Save cargo home cache