chore: import upstream snapshot with attribution

docker/utils/apt-install-and-clear.sh

@@ -0,0 +1,19 @@
+#!/bin/bash -e
+# 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.
+
+apt-get install $@ && apt-get clean

docker/utils/download-and-verify.sh

@@ -0,0 +1,50 @@
+#!/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.
+
+# Download a file with curl and verify its checksum (sha256 or sha512).
+if [[ "$#" -lt 4 || "$#" -gt 5 ]]; then
+    echo "Usage: $0 URL OUTPUT_PATH CHECKSUM_ALGO EXPECTED_CHECKSUM [RETRIES]" >&2
+    exit 2
+fi
+
+url="$1"
+output_path="$2"
+checksum_algo="$3"
+expected_checksum="$4"
+retries="${5:-0}"
+
+case "${checksum_algo}" in
+    sha256)
+        checksum_bin="sha256sum"
+        ;;
+    sha512)
+        checksum_bin="sha512sum"
+        ;;
+    *)
+        echo "Unsupported checksum algorithm: ${checksum_algo}" >&2
+        exit 2
+        ;;
+esac
+
+if [ "${retries}" -gt 0 ]; then
+    curl --retry "${retries}" -fsSL "${url}" -o "${output_path}"
+else
+    curl -fsSL "${url}" -o "${output_path}"
+fi
+
+printf "%s  %s\n" "${expected_checksum}" "${output_path}" | "${checksum_bin}" -c -