Dockerfile COPY指令失败并显式文件引用

Question

如果我的项目结构是这样的：

├── compose
│   ├── local
│   │   └── django
│   │       ├── Dockerfile
│   │       ├── celery
│   │       │   ├── beat
│   │       │   │   └── start.sh
│   │       │   └── worker
│   │       │       └── start.sh
│   │       └── start.sh
│   └── production
│       ├── caddy
│       │   ├── Caddyfile
│       │   └── Dockerfile.caddy
│       ├── django
│       │   ├── Dockerfile.django  

我是来自root，$  heroku container:push --recursive

但是，如果COPY失败，构建将失败：

Sending build context to Docker daemon  3.072kB
Step 1/2 : FROM abiosoft/caddy:0.10.6
 ---> d8ff070e1cee
Step 2/2 : COPY ./compose/production/caddy/Caddyfile /etc/Caddyfile
COPY failed: stat /var/lib/docker/tmp/docker-builder022230374/compose/production/caddy/Caddyfile: no such file or directory
 ▸    Error: docker build exited with 1  

实际的Dockerfile：

FROM abiosoft/caddy:0.10.6

COPY ./compose/production/caddy/Caddyfile /etc/Caddyfile

我已阅读此类似的stackoverflow帖子：Dockerfile COPY instruction failing?

根据最佳答案，我确实相信我在构建时明确引用了该文件 我猜不会。我错过了什么？