Each time a RUN instruction is added, a new layer is introduced in the final image.
This has a direct impact on the build time and
image size. Chaining commands in a single RUN instruction using && will use a single layer, thereby reducing the
number of layers in the image.
This practice can make Docker images more efficient and easier to manage.
Each layer in a Docker image is
essentially a change to the image, like a version control system.
So, fewer layers mean fewer changes to track, which simplifies management and
troubleshooting.
Exceptions
In multi-stage builds, the rule only scans instructions that are part of the final image.
