Michael Manganiello 0ca623329a Reduce Docker image size by only copying pip installed dependencies ...

Currently, the multi-stage Docker build makes the `release` stage
inherit from `dependencies`, which will include any files created by the
`pip install` process in the final image.

By using `pip install --user` to make dependencies be installed in
`~/.local`, we can only copy those files into the final image, reducing
the image size:

```
cloudflare-ddns-fix-applied     latest            68427bd7c88d   3 minutes ago   54.6MB
cloudflare-ddns-master          latest            2675320b651d   8 minutes ago   65.9MB
```

A good resource going deeper on how this approach works can be found at
https://pythonspeed.com/articles/multi-stage-docker-python/, solution 1.

2023-02-22 10:26:02 -03:00

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