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With multi-stage builds, you can use multiple FROM statements in your Dockerfile. Each FROM instruction can use a different base, and each of them begins a new stage of the build. You can selectively copy artifacts from one stage to another, leaving behind everything you don’t want in the final image.
I managed to make it work and the app is live. But, the build is taking around 30 minutes which still is very slow compared with 5 minutes on heroku or dokku in a droplet.