It looks like the nginx config in k8s is not applied, what's the problem?

Question

PHP

As part of the test, I raised the mini-cube, threw in nginx + php-fpm + mysql and an application on slim'e. At first everything worked, then I decided to put things in order, dragged everything into folders. And when I go to the test domain, I now see a 503 error. I tried to connect to the pod, it seems that the nginx config didn’t pull up, despite the presence of the config.yaml file, and it seems that volume, volumeMount are correctly specified ...
Now I’ve been sitting for 2 hours trying to figure out what was wrong and why it worked before. There are absolutely no promotions. And the logs are empty, or I'm looking in the wrong place at all.

https://github.com/ivekov/minikubeNginxPhpMysql

There is a suspicion that the problem is in these files:

/opt/docker/nginxPhpFpm/configs/backend/crud/config.yaml

kind: ConfigMap
apiVersion: v1
metadata:
  name: nginx-config
data:
  nginx.conf: |
    events {
    }
    http {
      server {
        listen 80 default_server;
        listen [::]:80 default_server;
        # Set nginx to serve files from the shared volume!
        root /var/www/html/public;
        server_name _;
        index index.php;
        location / {
          try_files $uri $uri/ /index.php?$query_string;
        }
        location ~ \.php$ {
          include fastcgi_params;
          fastcgi_param REQUEST_METHOD $request_method;
          fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
          fastcgi_pass 127.0.0.1:9000;
        }
      }
    }

/opt/docker/nginxPhpFpm/configs/backend/crud/deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-php-app
spec:
  replicas: 2
  selector:
     matchLabels:
        app: web
  template:
    metadata:
      labels:
        app: web
    spec:
      volumes:
        # Create the shared files volume to be used in both pods
        - name: app-files
          hostPath:
            path: /opt/docker/nginxPhpFpm/app/backend
            type: Directory
        - name: nginx-config-volume
          configMap:
            name: nginx-config
      containers:
        - name: backend
          image: nginx
          ports:
            - containerPort: 80
          volumeMounts:
            - name: app-files
              mountPath: /var/www/html
            - name: nginx-config-volume
              mountPath: /etc/nginx/nginx.conf
              subPath: nginx.conf
          env:
            - name: DB_HOST
              value: mysql
            - name: MYSQL_ROOT_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: mysql-pass
                  key: password
        - name: php-fpm
          image: ivekov/php-fpm
          volumeMounts:
            - name: app-files
              mountPath: /var/www/html
          lifecycle:
            postStart:
              exec:
                command: ["/bin/sh", "-c", "cp -r /app/. /var/www/html"]

I would really appreciate help...