Docker Multistage Cache Example

This is an example Django project to illustrate the usage of building intermediate stages and leveraging their built image for caching.

Prerequisites

Build the intermediate dependency stages into separate images with --target being the stage's name and a -t tag that you could later identify it with. I.e:
```
docker build --target=dependencies -t django_example:dep .
```
Build the final image use --cache-from listing the intermediate image. I.e:
```
docker build --cache-from django_example:dep -t django_example:final .
```