fix: ensure GH action and Bazel use consistent --repository_cache value

.bazelrc

@@ -124,7 +124,6 @@ build:argument-comment-lint --@rules_rust//rust/toolchain/channel=nightly
 common:ci-windows --config=ci-bazel
 common:ci-windows --build_metadata=TAG_os=windows
 common:ci-windows --repo_contents_cache=D:/a/.cache/bazel-repo-contents-cache
-common:ci-windows --repository_cache=D:/a/.cache/bazel-repo-cache
 
 # We prefer to run the build actions entirely remotely so we can dial up the concurrency.
 # We have platform-specific tests, so we want to execute the tests on all platforms using the strongest sandboxing available on each platform.

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

@@ -12,6 +12,9 @@ outputs:
   cache-hit:
     description: Whether the Bazel repository cache key was restored exactly.
     value: ${{ steps.cache_bazel_repository_restore.outputs.cache-hit }}
+  repository-cache-path:
+    description: Filesystem path used for the Bazel repository cache.
+    value: ${{ steps.configure_bazel_repository_cache.outputs.repository-cache-path }}
 
 runs:
   using: composite
@@ -41,14 +44,26 @@ runs:
     - name: Set up Bazel
       uses: bazelbuild/setup-bazelisk@v3
 
+    - name: Configure Bazel repository cache
+      id: configure_bazel_repository_cache
+      shell: pwsh
+      run: |
+        # Keep the repository cache under HOME on all runners. Windows `D:\a`
+        # cache paths match `.bazelrc`, but `actions/cache/restore` currently
+        # returns HTTP 400 for that path in the Windows clippy job.
+        $repositoryCachePath = Join-Path $HOME '.cache/bazel-repo-cache'
+        "repository-cache-path=$repositoryCachePath" | Out-File -FilePath $env:GITHUB_OUTPUT -Encoding utf8 -Append
+        "BAZEL_REPOSITORY_CACHE=$repositoryCachePath" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+
     # Restore bazel repository cache so we don't have to redownload all the external dependencies
-    # on every CI run.
+    # on every CI run. Keep restore failures non-fatal so transient cache-service
+    # errors degrade to a cold build instead of failing the job.
     - name: Restore bazel repository cache
       id: cache_bazel_repository_restore
+      continue-on-error: true
       uses: actions/cache/restore@v5
       with:
-        path: |
-          ~/.cache/bazel-repo-cache
+        path: ${{ steps.configure_bazel_repository_cache.outputs.repository-cache-path }}
         key: bazel-cache-${{ inputs.target }}-${{ hashFiles('MODULE.bazel', 'codex-rs/Cargo.lock', 'codex-rs/Cargo.toml') }}
         restore-keys: |
           bazel-cache-${{ inputs.target }}
@@ -65,10 +80,6 @@ runs:
         $repoContentsCache = Join-Path $env:RUNNER_TEMP "bazel-repo-contents-cache-$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
-        if (-not $hasDDrive) {
-          $repositoryCache = Join-Path $env:USERPROFILE '.cache\bazel-repo-cache'
-          "BAZEL_REPOSITORY_CACHE=$repositoryCache" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
-        }
 
     - name: Expose MSVC SDK environment (Windows)
       if: runner.os == 'Windows'

.github/workflows/bazel.yml

@@ -116,8 +116,7 @@ jobs:
         continue-on-error: true
         uses: actions/cache/save@668228422ae6a00e4ad889ee87cd7109ec5666a7 # v5
         with:
-          path: |
-            ~/.cache/bazel-repo-cache
+          path: ${{ steps.setup_bazel.outputs.repository-cache-path }}
           key: bazel-cache-${{ matrix.target }}-${{ hashFiles('MODULE.bazel', 'codex-rs/Cargo.lock', 'codex-rs/Cargo.toml') }}
 
   clippy:
@@ -190,6 +189,5 @@ jobs:
         continue-on-error: true
         uses: actions/cache/save@668228422ae6a00e4ad889ee87cd7109ec5666a7 # v5
         with:
-          path: |
-            ~/.cache/bazel-repo-cache
+          path: ${{ steps.setup_bazel.outputs.repository-cache-path }}
           key: bazel-cache-${{ matrix.target }}-${{ hashFiles('MODULE.bazel', 'codex-rs/Cargo.lock', 'codex-rs/Cargo.toml') }}