Linux_arm64 is not supported by choosenim - docker build

[romanzac]

Building Docker image on Mac with ARM ends with:

 => [stage-1 3/8] RUN mkdir -p /usr/status-user && chmod -R 777 /usr/status-user                                                          0.1s
 => [stage-1 4/8] RUN mkdir -p /static/configs                                                                                            0.1s
 => ERROR [builder  3/12] RUN curl https://nim-lang.org/choosenim/init.sh -sSf | sh -s -- -y     && /root/.nimble/bin/choosenim 2.2.4     1.4s
------
 > [builder  3/12] RUN curl https://nim-lang.org/choosenim/init.sh -sSf | sh -s -- -y     && /root/.nimble/bin/choosenim 2.2.4:
1.396 choosenim-init: Error: Sorry, your platform (linux_arm64) is not supported by choosenim.
1.396 choosenim-init: Error: You will need to install Nim using an alternative method.
1.396 choosenim-init: Error: See the following link for more info: https://nim-lang.org/install.html
------
Dockerfile:16
--------------------
  15 |     ENV CHOOSENIM_NO_ANALYTICS=1
  16 | >>> RUN curl https://nim-lang.org/choosenim/init.sh -sSf | sh -s -- -y \
  17 | >>>     && /root/.nimble/bin/choosenim ${NIM_VERSION}
  18 |

Impact

High occurrence, low impact.

To reproduce

1. Checkout https://github.com/status-im/status-go/tree/develop
2. Setup prerequisites for functional tests (Docker, Anvil, etc.)
3. docker build --tag "statusgo-$(git rev-parse --short HEAD)" .

Expected behavior

Possibly use Docker builder with Nim compiler built from sources and have this cached in subsequent builds. Or make Choosenim community to add support for linux_arm64. Temporary workaround - undo #7185