Use s390x native actions runner binaries (#64)

Add a s390x Dockerfile utilizing custom-built s390x-native runner:
https://github.com/theihor/s390x-actions-runner/releases/tag/v2.321.0

Signed-off-by: Ihor Solodrai <ihor.solodrai@pm.me>

Author: theihor

.github/workflows/publish.yml

@@ -43,7 +43,7 @@ jobs:
         arch: [s390x, aarch64, x86_64]
         include:
           - arch: s390x
-            dockerfile: s390x.Dockerfile
+            dockerfile: s390x-native.Dockerfile
             platform: linux/s390x
           - arch: aarch64
             dockerfile: Dockerfile

s390x-native.Dockerfile

@@ -0,0 +1,38 @@
+# Self-Hosted IBM Z Github Actions Runner.
+ARG UBUNTU_VERSION=noble
+FROM --platform=linux/s390x ubuntu:${UBUNTU_VERSION}
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && apt-get -y install \
+    bc bison cmake cpu-checker curl dumb-init ethtool flex gawk git \
+    iproute2 iptables iputils-ping jq keyutils linux-image-generic \
+    python3 rsync software-properties-common sudo tree wget zstd
+RUN apt-get -y install \
+    qemu-guest-agent qemu-kvm qemu-utils \
+    qemu-system-arm qemu-system-s390x qemu-system-x86
+RUN apt-get install -y \
+    aspnetcore-runtime-8.0
+RUN apt-get clean
+
+ARG version=2.321.0
+ARG homedir=/actions-runner
+
+# Copy scripts from  myoung34/docker-github-actions-runner
+RUN curl -L https://raw.githubusercontent.com/myoung34/docker-github-actions-runner/${version}/entrypoint.sh -o /entrypoint.sh && chmod 755 /entrypoint.sh
+RUN curl -L https://raw.githubusercontent.com/myoung34/docker-github-actions-runner/${version}/token.sh -o /token.sh && chmod 755 /token.sh
+
+RUN useradd -d ${homedir} -m runner
+RUN echo "runner ALL=(ALL) NOPASSWD: ALL" >>/etc/sudoers
+RUN echo "Defaults env_keep += \"DEBIAN_FRONTEND\"" >>/etc/sudoers
+# Make sure kvm group exists. This is a no-op when it does.
+RUN addgroup --system kvm
+RUN usermod -a -G kvm runner
+USER runner
+ENV USER=runner
+WORKDIR ${homedir}
+
+RUN curl -L https://github.com/theihor/s390x-actions-runner/releases/download/v${version}/actions-runner-linux-s390x-${version}.tar.gz | tar -xz
+USER root
+
+ENTRYPOINT ["/entrypoint.sh"]
+CMD ["./bin/Runner.Listener", "run", "--startuptype", "service"]