ci : trigger self-hosted CI on changes to ci/run.sh (#28859)

The workflow's push/pull_request path filters did not include the
ci/run.sh script that all of its jobs execute, so changes to it never
re-triggered the self-hosted CI.

Assisted-by: pi:llama.cpp/Qwen3.8-27B

.github/workflows/build-self-hosted.yml

@@ -7,6 +7,7 @@ on:
       - master
     paths: [
       '.github/workflows/build-self-hosted.yml',
+      'ci/run.sh',
       '**/CMakeLists.txt',
       '**/.cmake',
       '**/*.h',
@@ -27,6 +28,7 @@ on:
     types: [opened, synchronize, reopened]
     paths: [
       '.github/workflows/build-self-hosted.yml',
+      'ci/run.sh',
       '**/CMakeLists.txt',
       '**/.cmake',
       '**/*.h',