diff --git a/.github/workflows/build-sanitize.yml b/.github/workflows/build-sanitize.yml
index e242abcfd..9654cb4e4 100644
--- a/.github/workflows/build-sanitize.yml
+++ b/.github/workflows/build-sanitize.yml
@@ -15,6 +15,12 @@ on:
       '**/*.cpp'
     ]
 
+  pull_request:
+    types: [opened, synchronize, reopened]
+    paths: [
+      '.github/workflows/build-sanitize.yml'
+    ]
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref && github.ref || github.run_id }}
   cancel-in-progress: true
@@ -28,19 +34,35 @@ env:
 
 jobs:
   ctest:
-    runs-on: [self-hosted, X64, CPU, Linux]
-
     continue-on-error: true
 
     strategy:
       matrix:
-        sanitizer: [ADDRESS, THREAD, UNDEFINED]
+        include:
+        - sanitizer: ADDRESS
+          machine: [self-hosted, X64, Linux]
+        # thread doesn't run properly on some self hosted machines, so run it on Github instead
+        - sanitizer: THREAD
+          machine: ubuntu-24.04
+        - sanitizer: UNDEFINED
+          machine: [self-hosted, X64, Linux]
+
+    runs-on: ${{ matrix.machine }}
 
     steps:
       - name: Clone
         id: checkout
         uses: actions/checkout@v6
 
+      - name: ccache
+        uses: ggml-org/ccache-action@v1.2.21
+        if: ${{ matrix.sanitizer == 'THREAD' }}
+        with:
+          key: ctest-thread-ubuntu-24.04
+          variant: ccache
+          evict-old-files: 1d
+          save: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' }}
+
       # with UNDEFINED sanitizer, we have to build in Debug to avoid GCC 13 false-positive warnings
       - name: Build (undefined)
         id: cmake_build_undefined