util-docker: Create ALL/gem5.fast docker image with min-deps

This docker image contains ALL/gem5.fast compiled using the 22.04
min-dependencies image.

This image is available at gcr.io/gem5-test/gem5-all-min-dependencies:

```
docker pull gcr.io/gem5-test/gem5-all-min-dependencies
```

Change-Id: I0af4a629e7082df1d76a8459ebfc4fb0a91e2855
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/64431
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
2 files changed