[CI][ACL] Enable ACL installation in ci_cpu docker container (#5916)

This patch adds a cross-compiled ACL build to the ci_cpu dockerfile used for CI.

Change-Id: I66e1521ab553306bc7367b65acc0363e750f0211

docker/Dockerfile.ci_cpu

@@ -74,3 +74,7 @@ RUN bash /install/ubuntu_install_tflite.sh
 # TensorFlow deps
 COPY install/ubuntu_install_tensorflow.sh /install/ubuntu_install_tensorflow.sh
 RUN bash /install/ubuntu_install_tensorflow.sh
+
+# Arm(R) Compute Library
+COPY install/ubuntu_install_arm_compute_lib.sh /install/ubuntu_install_arm_compute_lib.sh
+RUN bash /install/ubuntu_install_arm_compute_lib.sh

docker/install/ubuntu_install_arm_compute_lib.sh

@@ -0,0 +1,71 @@
+#!/bin/bash
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+set -e
+set -u
+set -o pipefail
+
+repo_url="https://github.com/ARM-software/ComputeLibrary.git"
+repo_dir="acl"
+install_path="/opt/$repo_dir"
+architecture_type=$(uname -i)
+target_arch="arm64-v8a" # arm64-v8a/armv7a
+build_type="native"
+
+tmpdir=$(mktemp -d)
+
+cleanup()
+{
+  rm -rf "$tmpdir"
+}
+
+trap cleanup 0
+
+apt-get update && \
+apt-get install -y --no-install-recommends \
+    git \
+    scons \
+    bsdmainutils \
+    build-essential \
+    g++-aarch64-linux-gnu \
+    gcc-aarch64-linux-gnu
+
+cd "$tmpdir"
+
+git clone "$repo_url" "$repo_dir"
+
+cd "$repo_dir"
+
+# pin version to v20.05
+git checkout 6a7771e
+
+if [ "$architecture_type" != "aarch64" ]; then
+  build_type="cross_compile"
+fi
+
+scons \
+  install_dir="$install_path" \
+  Werror=1 \
+  -j8 \
+  debug=0 \
+  asserts=0 \
+  neon=1 \
+  opencl=0 \
+  os=linux \
+  arch="$target_arch" \
+  build="$build_type"