Publish diagnostic if IP address of EXPOSE is invalid

The Docker builder will create an error if the IP address of an `EXPOSE` instruction is invalid. We should publish a diagnostic for this same error.
```Dockerfile
FROM scratch
EXPOSE 8080::8081
```
```
$ docker build .
Sending build context to Docker daemon  86.15MB
Step 1/2 : FROM scratch
 --->
Step 2/2 : EXPOSE 8080::8081
Invalid ip address: 8080
```