Add node constraints to containers in docker-compose.yml

docker-compose.yml

     build:
       context: ./images/rpi-openldap/
     image: bingen/rpi-openldap:latest
+    deploy:
+      placement:
+        constraints:
+          - node.role == manager
     secrets:
       - source: ldap_pwd
         target: admin_pwd
         - NEXTCLOUD_DATA_PATH=${NEXTCLOUD_DATA_PATH}
         - NEXTCLOUD_BACKUP_PATH=${NEXTCLOUD_BACKUP_PATH}
     image: bingen/rpi-nextcloud:latest
+    deploy:
+      placement:
+        constraints:
+          - node.role == worker
     depends_on:
       - db
       - openldap
     image: bingen/rpi-gogs
     depends_on:
       - db
+      - openldap
     env_file:
       - gogs.env
     ports: