Set up self hosted runner for integration tests

Author: beveradb

.github/workflows/run-integration-tests.yaml

@@ -5,7 +5,7 @@ on:
 
 jobs:
   integration-test:
-    runs-on: ubuntu-latest
+    runs-on: self-hosted
     env:
       AUDIO_SEPARATOR_MODEL_DIR: ${{ github.workspace }}/models