扩展本地Dockerfile

我正在尝试将Dockerfile基于另一个本地文件.

$ls -lR
total 0
-rw-r--r--  1 me     me      42 14 avr 10:42 Dockerfile
drwxr-xr-x  3 me     me      42 14 avr 10:42 prod

./prod:
total 0
-rw-r--r--  1 me     me      42 14 avr 10:42 Dockerfile

$cat prod/Dockerfile
FROM ../Dockerfile
...

$docker build - < prod/Dockerfile

unable to process Dockerfile: unable to parse repository info: repository name component must match “a-z0-9(?:[._]a-z0-9)*”

我知道FROM期望图像而不是路径.

如何从prod / Dockerfile扩展Dockerfile？