title: Adding a tag to all images in a docker-compose file?
body: <p>For all my images I have a <code>latest</code> tag for production, and <code>test</code> for testing. I also have 2 docker-compose files that only differ in that one uses <code>latest</code> on all packages (except nginx), while the other uses <code>test</code>. Is there a way to set this via a CLI variable, so that I don't have to keep those two files in sync manually all the time?</p>