I've been making a custom build image in large part because of this. Local testing with Docker isn't the most fun, I have to manually manage the environment var

I've been making a custom build image in large part because of this. Local testing with Docker isn't the most fun, I have to manually manage the environment variables I pass on the command line, but it's way better than commit then wait for Docker to schedule. Once it's working locally I push up and it's usually only a commit or two away from working.