Built and deployed successfully at https://dashboard.heroku.com/apps/multi-stages-staging

The updated dockerfile can be found here.

Build time

Usually, it takes around ~ 3 mins to build the docker image.

<aside> 💡 It was reduced to 50 seconds to build and push the Docker image on Github Action.

</aside>

Visualization

• For the red and the orange rectangles, they keep the original resources and can be reduced after building the gems and assets.
• The final image was combined by the green steps (only).

Image size

• Reduced the image size from ~800MB to 281MB by:
  • Removing the /tmp/docker after installing and copying the bundle and assets to the Final Image.
  • Keep the needed dependencies to run the application only.