CI for Arm64

[gfoidl]

[gfoidl]

Maybe https://dev.to/jeikabu/migrating-to-dockerqemu-2af6 works?

[gfoidl]

docker run --rm --privileged multiarch/qemu-user-static:register    # to setup
docker run -it --rm multiarch/ubuntu-debootstrap:arm64-focal

apt update
apt install -y --no-install-recommends \
    libc6 \
    libgcc1 \
    libgssapi-krb5-2 \
    libicu66 \
    libssl1.1 \
    libstdc++6 \
    zlib1g \
    curl

export DOTNET_SDK_VERSION=7.0.100-rc.1.22431.12
curl -SLk --output dotnet.tar.gz https://dotnetcli.blob.core.windows.net/dotnet/Sdk/$DOTNET_SDK_VERSION/dotnet-sdk-$DOTNET_SDK_VERSION-linux-arm64.tar.gz
mkdir -p /usr/share/dotnet
tar -v -zxf dotnet.tar.gz -C /usr/share/dotnet
rm dotnet.tar.gz
ln -s /usr/share/dotnet/dotnet /usr/bin/dotnet

# If needed
git clone https://github.com/gfoidl/Base64.git
cd Base64/tests/gfoidl.Base64.Tests

Host: ./build.sh build
dotnet test gfoidl.Base64.Tests.dll

works and even supports AdvSimd 🎉

[gfoidl]

😢 but on dotnet test gfoidl.Base64.Tests.dll there are always some infra-failures like NullRef-exceptions, etc.

Need to find another way -- maybe https://www.reddit.com/r/docker/comments/c75uhq/comment/esdf06y/?utm_source=share&utm_medium=web2x&context=3

[gfoidl]

https://www.reddit.com/r/docker/comments/c75uhq/comment/esdf06y/?utm_source=share&utm_medium=web2x&context=3 works a bit better, but still has some strange failure not related to product code and is extremely slow.

I think the best option at the moment is to just rent a arm64-VM (e.g. Google Cloud), install .NET and do build.sh build && build.sh test there.
I did this, all tests passed.