fixed volume declaration

docker-compose.yml

@@ -6,16 +6,16 @@ services:
     ports:
       - "80:80"
     volumes:
-      - static-files: /usr/share/nginx/html
-      - webhooks-git-ssh: /root/.ssh
-      - webhooks-git-data: /etc/webhook/
+      - static-files:/usr/share/nginx/html
+      - webhooks-git-ssh:/root/.ssh
+      - webhooks-git-data:/etc/webhook/
 
   webhooks-git:
     build:
       context: ./webhooks-git
       dockerfile: Dockerfile
     volumes:
-      - static-files: /etc/static-files
+      - static-files:/etc/static-files
 
 volumes:
   static-files: