Update coverage-workflow.yml

.github/workflows/coverage-workflow.yml

@@ -8,17 +8,12 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: self-hosted
 
     steps:
       - name: Check out code
         uses: actions/checkout@v3
 
-      - name: Set up Python
-        uses: actions/setup-python@v4
-        with:
-          python-version: 3.9
-
       - name: Build Docker image for tests
         working-directory: backend
         run: |