Reuse cross-container to use Maturin

[RaulTrombin]

Someone can give a light here?
I'm trying to discover what cross command does:

When I do a:
cross build --target armv7-unknown-linux-gnueabihf
It opens a container,
(with docker ps)
IMAGE http://ghcr.io/cross-rs/armv7-unknown-linux-gnueabihf:0.2.5
COMMAND "sh -c 'PATH=$PATH:/rust/bin cargo build --target armv7-unknown-linux-gnueabihf'"
I would like to know how to call this container from my terminal,

Basically what I would like is to install maturin on it.

FROM ghcr.io/cross-rs/armv7-unknown-linux-gnueabihf
RUN apt update && apt install -y --no-install-recommends python3 python3-pip && pip3 install -U pip
RUN pip3 install maturin

Then instead of doing what cross does, call maturin and not cargo.

[Emilgardis]

If you add -v you'll see what happens

I've outlined the steps in this reddit comment

this seems related to #1266 btw