ci: Use native platform for win-cross task #33558

Forcing the architecture to amd64 is no longer required. Dropping it should have some benefits:

• Faster CI speed on other arches (riscv64, arm, ...)
• Unlock the CI task to run on riscv64 at all

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For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/33558.

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Tested fa6fd16f36e1240cda58a46e1717b02e8d3172a3:

$ uname -mo
riscv64 GNU/Linux
$ docker --version
podman version 4.3.1
$ env -i HOME="$HOME" PATH="$PATH" USER="$USER" bash -c 'MAKEJOBS="-j3" FILE_ENV="./ci/test/00_setup_env_win64.sh" ./ci/test_run_all.sh'
<snip>
+ echo 'Creating mirror.gcr.io/ubuntu:24.04 container to run in'
Creating mirror.gcr.io/ubuntu:24.04 container to run in
+ docker buildx build --file /home/hebasto/dev/bitcoin/ci/test_imagefile --build-arg CI_IMAGE_NAME_TAG=mirror.gcr.io/ubuntu:24.04 --build-arg FILE_ENV=./ci/test/00_setup_env_win64.sh --build-arg BASE_ROOT_DIR=/ci_container_base --platform=linux --label=bitcoin-ci-test --tag=ci_win64 /home/hebasto/dev/bitcoin
Error: invalid platform syntax for "linux" (use OS/ARCH[/VARIANT][,...])
Command '['./ci/test/02_run_container.sh']' returned non-zero exit status 125.

Error: invalid platform syntax for "linux" (use OS/ARCH[/VARIANT][,...])

thanks for testing. However, this looks like an unrelated issue with your podman version. I presume you can't run any native task at all. My recommendation would be to upgrade your os (or podman) to the latest stable version.

• Unlock the CI task to run on riscv64 at all

Isn't this relevant to other tasks as well, for example, ci/test/00_setup_env_arm.sh?

ACK fa6fd16f36e1240cda58a46e1717b02e8d3172a3, tested on Ubuntu 24.04, RISC-V.

• Unlock the CI task to run on riscv64 at all

Isn't this relevant to other tasks as well, for example, ci/test/00_setup_env_arm.sh?

That task requires the aarch64 architecture and is not a native task. Not sure if it matters much if qemu-aarch64 is running on x86 or riscv, but feel free to open a separate issue or pull request. The goal here is mainly to speed up the win-cross task for non-x86 arches. Being able to run it on riscv64 is a nice cherry on top.