ci: Add dist-aarch64-freebsd

Add scripts to build the aarch64-unknown-freebsd target in CI.
Implements MCP: rust-lang/compiler-team#961

Author: mrkajetanp

src/ci/docker/host-aarch64/dist-aarch64-freebsd/Dockerfile

@@ -0,0 +1,44 @@
+FROM ubuntu:26.04
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  clang \
+  make \
+  ninja-build \
+  file \
+  curl \
+  ca-certificates \
+  python3 \
+  git \
+  cmake \
+  sudo \
+  bzip2 \
+  xz-utils \
+  texinfo \
+  wget \
+  libssl-dev \
+  pkg-config \
+  && rm -rf /var/lib/apt/lists/*
+
+COPY scripts/freebsd-toolchain.sh /tmp/
+RUN /tmp/freebsd-toolchain.sh aarch64
+
+COPY scripts/sccache.sh /scripts/
+RUN sh /scripts/sccache.sh
+
+COPY scripts/cmake.sh /scripts/
+RUN /scripts/cmake.sh
+
+ENV \
+    AR_aarch64_unknown_freebsd=aarch64-unknown-freebsd14-ar \
+    CC_aarch64_unknown_freebsd=aarch64-unknown-freebsd14-clang \
+    CXX_aarch64_unknown_freebsd=aarch64-unknown-freebsd14-clang++
+
+ENV HOSTS=aarch64-unknown-freebsd
+
+ENV RUST_CONFIGURE_ARGS="--enable-full-tools \
+    --enable-extended \
+    --enable-profiler \
+    --enable-sanitizers \
+    --disable-docs"
+
+ENV SCRIPT="python3 ../x.py dist --host $HOSTS --target $HOSTS"

src/ci/docker/scripts/freebsd-toolchain.sh

@@ -46,6 +46,7 @@ mkdir -p "$sysroot"
 case $arch in
   (x86_64) freebsd_arch=amd64 ;;
   (i686) freebsd_arch=i386 ;;
+  (aarch64) freebsd_arch=arm64 ;;
 esac
 
 files_to_extract=(

src/ci/github-actions/jobs.yml

@@ -261,6 +261,9 @@ auto:
   - name: dist-x86_64-freebsd
     <<: *job-linux-4c
 
+  - name: dist-aarch64-freebsd
+    <<: *job-linux-4c
+
   - name: dist-x86_64-illumos
     <<: *job-linux-4c