diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index c3ae8fce1..24f0c30c1 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -135,6 +135,11 @@ jobs:
           FLAKE_REGRESSION_GLOB: ${{ matrix.glob }}
           NIX_CONFIG: ${{ matrix.nix_config }}
         run: |
+          set -x
+          if [ ! -z "${NSC_CACHE_PATH:-}" ]; then
+            mkdir -p "${NSC_CACHE_PATH}/nix/xdg-cache"
+            export XDG_CACHE_HOME="${NSC_CACHE_PATH}/nix/xdg-cache"
+          fi
           nix build -L --out-link ./new-nix
           export PATH=$(pwd)/new-nix/bin:$PATH
 
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 82f54ddf5..832228296 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -35,7 +35,7 @@ jobs:
     uses: ./.github/workflows/build.yml
     with:
       system: x86_64-linux
-      runner: UbuntuLatest32Cores128G
+      runner: namespace-profile-linuxamd32c64g-cache
       runner_small: ubuntu-latest
       run_tests: true
       run_vm_tests: true