Add possibility to have a custom named Dockerfile

### What feature do you want to see added?

We have a project setup that needs a seperate Dockerfile. We have a Dockerfile and a file called db.dockerfile.

With docker build there is a possibility to have a custom named Dockerfile "docker build -f customnamedDockerfile ."

See https://docs.docker.com/engine/reference/commandline/build/#file)

It would be nice to have that option in your plugin.

### Upstream changes

_No response_