[ci] Use native arm runner instead of cross compiling

.github/workflows/main.yml

@@ -26,23 +26,7 @@ jobs:
             os: ubuntu-24.04
 
           - artifact: arm64-linux
-            os: ubuntu-24.04
-            rust_target: aarch64-unknown-linux-gnu
-            env:
-              # Don't build a sysroot for this cross-compiled target since it
-              # would require a host compiler and the sysroot is otherwise
-              # already built on other CI builders.
-              WASI_SDK_CI_SKIP_SYSROOT: 1
-
-              WASI_SDK_CI_TOOLCHAIN_LLVM_CMAKE_ARGS: >-
-                -DCMAKE_C_COMPILER=aarch64-linux-gnu-gcc
-                -DCMAKE_CXX_COMPILER=aarch64-linux-gnu-g++
-                -DCMAKE_CROSSCOMPILING=True
-                -DCMAKE_CXX_FLAGS=-march=armv8-a
-                -DCMAKE_SYSTEM_PROCESSOR=arm64
-                -DCMAKE_SYSTEM_NAME=Linux
-                -DLLVM_HOST_TRIPLE=aarch64-linux-gnu
-                -DRUST_TARGET=aarch64-unknown-linux-gnu
+            os: ubuntu-22.04-arm
 
           - artifact: arm64-macos
             os: macos-14

ci/docker-build.sh

@@ -1,8 +1,7 @@
 #!/bin/sh
 
 # This is a helper script invoked from CI which will execute the `ci/build.sh`
-# script within a docker container. This builds `ci/docker/Dockerfile.common`
-# along with the specified `ci/docker/Dockerfile.$x` from the command line.
+# script within a docker container. This contain is built using the Dockerfile located at `ci/docker/Dockerfile`
 # This container is then used to execute `ci/build.sh`.
 
 set -e
@@ -16,17 +15,8 @@ fi
 
 set -x
 
-# Build the base image which the image below can used.
-docker build \
-  --file ci/docker/Dockerfile.common \
-  --tag wasi-sdk-builder-base \
-  ci/docker
-
-# Build the container that is going to be used
-docker build \
-  --file ci/docker/Dockerfile.$1 \
-  --tag wasi-sdk-builder \
-  ci/docker
+# Build the Docker imager
+docker build --tag wasi-sdk-builder ci/docker
 
 # Perform the build in `/src`. The current directory is mounted read-write at
 # this location as well. To ensure that container-created files are reasonable

ci/docker/Dockerfile.common → ci/docker/Dockerfile

@@ -19,17 +19,20 @@ RUN apt-get update \
 
 # Install a more recent version of CMake than what 18.04 has since that's what
 # LLVM requires.
-RUN curl -sSLO https://github.com/Kitware/CMake/releases/download/v3.29.5/cmake-3.29.5-linux-x86_64.tar.gz \
-  && tar xf cmake-3.29.5-linux-x86_64.tar.gz \
-  && rm cmake-3.29.5-linux-x86_64.tar.gz \
+RUN ARCH=$(uname -m) \
+  && curl -sSLO https://github.com/Kitware/CMake/releases/download/v3.29.5/cmake-3.29.5-linux-${ARCH}.tar.gz \
+  && tar xf cmake-3.29.5-linux-${ARCH}.tar.gz \
+  && rm cmake-3.29.5-linux-${ARCH}.tar.gz \
   && mkdir -p /opt \
-  && mv cmake-3.29.5-linux-x86_64 /opt/cmake
+  && mv cmake-3.29.5-linux-${ARCH} /opt/cmake
 
 ENV PATH /opt/cmake/bin:$PATH
 
 # As with CMake install a later version of Ninja than waht 18.04 has.
-RUN curl -sSLO https://github.com/ninja-build/ninja/releases/download/v1.12.1/ninja-linux.zip \
-  && unzip ninja-linux.zip \
+RUN ARCH=$(uname -m) \
+  && if [ "$ARCH" = "aarch64"  ]; then SUFFIX=-aarch64; fi \
+  && curl -sSL -o ninja.zip https://github.com/ninja-build/ninja/releases/download/v1.12.1/ninja-linux${SUFFIX}.zip \
+  && unzip ninja.zip \
   && rm *.zip \
   && mv ninja /opt/cmake/bin