Add docker entrypoint.

.release/docker/entrypoint.sh

@@ -0,0 +1,34 @@
+# SPDX-FileCopyrightText: 2024 Comcast Cable Communications Management, LLC
+# SPDX-License-Identifier: Apache-2.0
+#!/usr/bin/env sh
+set -e
+
+# check arguments for an option that would cause /xmidt-agent to stop
+# return true if there is one
+_want_help() {
+    local arg
+    for arg; do
+        case "$arg" in
+            -'?'|-h|--help|-s|--show)
+                return 0
+                ;;
+        esac
+    done
+    return 1
+}
+
+_main() {
+    # if command starts with an option, prepend xmidt-agent
+    if [ "${1:0:1}" = '-' ]; then
+        set -- /xmidt-agent "$@"
+    fi
+
+    # skip setup if they aren't running /xmidt-agent or want an option that stops /xmidt-agent
+    if [ "$1" = '/xmidt-agent' ] && ! _want_help "$@"; then
+        echo "Entrypoint script for xmidt-agent Client ${VERSION} started."
+    fi
+
+    exec "$@"
+}
+
+_main "$@"