[CI] Build a Python wheel for aarch64 platform (#6253)

tests/ci_build/Dockerfile.aarch64

@@ -0,0 +1,37 @@
+FROM quay.io/pypa/manylinux2014_aarch64
+
+SHELL ["/bin/bash", "-c"]   # Use Bash as shell
+
+# Install all basic requirements
+RUN \
+    yum update -y && \
+    yum install -y tar unzip wget xz git centos-release-scl-rh yum-utils && \
+    yum-config-manager --enable centos-sclo-rh-testing && \
+    yum update -y && \
+    yum install -y devtoolset-7 && \
+    # Python
+    wget --no-verbose -O conda.sh https://github.com/conda-forge/miniforge/releases/download/4.8.2-1/Miniforge3-4.8.2-1-Linux-aarch64.sh && \
+    bash conda.sh -b -p /opt/miniforge-python
+
+ENV PATH=/opt/miniforge-python/bin:$PATH
+ENV CC=/opt/rh/devtoolset-7/root/usr/bin/gcc
+ENV CXX=/opt/rh/devtoolset-7/root/usr/bin/c++
+ENV CPP=/opt/rh/devtoolset-7/root/usr/bin/cpp
+ENV GOSU_VERSION 1.10
+
+# Create new Conda environment
+COPY conda_env/aarch64_test.yml /scripts/
+RUN conda env create -n aarch64_test --file=/scripts/aarch64_test.yml
+
+# Install lightweight sudo (not bound to TTY)
+RUN set -ex; \
+    wget --no-verbose -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-arm64" && \
+    chmod +x /usr/local/bin/gosu && \
+    gosu nobody true
+
+# Default entry-point to use if running locally
+# It will preserve attributes of created files
+COPY entrypoint.sh /scripts/
+
+WORKDIR /workspace
+ENTRYPOINT ["/scripts/entrypoint.sh"]