fix: use named volume for prometheus config, seed in CD workflow

.gitea/workflows/cd.yml

@@ -40,6 +40,24 @@ jobs:
           NGINX_PORT=80
           EOF
 
+      - name: Seed Prometheus config
+        run: |
+          mkdir -p monitoring/prometheus
+          cat > monitoring/prometheus/prometheus.yml << 'EOF'
+          global:
+            scrape_interval: 15s
+            evaluation_interval: 15s
+
+          scrape_configs:
+            - job_name: 'prometheus'
+              static_configs:
+                - targets: ['localhost:9090']
+
+            - job_name: 'linearvoid'
+              static_configs:
+                - targets: ['playout:8081', 'chat:3000', 'nginx:80']
+          EOF
+
       - name: Deploy with docker-compose
         env:
           DOCKER_HOST: tcp://192.168.88.40:2375