chore: update Python version in Dockerfile and improve test commands in Makefile

- Upgraded Python version in Dockerfile from 3.9 to 3.11.9 for enhanced performance and security.
- Adjusted paths in Dockerfile to reflect the new Python version.
- Modified test commands in Makefile to activate the virtual environment before running tests, ensuring proper dependency management.

.github/workflows/ci.yml

@@ -0,0 +1,45 @@
+name: CI - Infrastructure Tests
+
+on:
+  push:
+    branches: [ main, develop, 'feature/**' ]
+  pull_request:
+    branches: [ main, develop ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    name: Run Infrastructure Tests
+    
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      
+      - name: Set up Python 3.11
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+          cache: 'pip'
+      
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r tests/infra/requirements-test.txt
+      
+      - name: Run infrastructure tests
+        run: |
+          python -m pytest tests/infra/ -v --tb=short
+      
+      - name: Validate Prometheus config
+        run: |
+          python -m pytest tests/infra/test_prometheus_config.py -v
+      
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v3
+        with:
+          name: test-results
+          path: |
+            .pytest_cache/
+            htmlcov/
+          retention-days: 7