docker: Add a rootless container

New images with "-rootless" tags will automatically get released on the docker registry.

docker-entrypoint-rootless.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+CONFIG_FILE=/data/lldap_config.toml
+
+if [ ! -f "$CONFIG_FILE" ]; then
+  echo "[entrypoint] Copying the default config to $CONFIG_FILE"
+  echo "[entrypoint] Edit this $CONFIG_FILE to configure LLDAP."
+  if cp /app/lldap_config.docker_template.toml $CONFIG_FILE; then
+     echo "Configuration copied successfully."
+  else
+     echo "Fail to copy configuration, check permission on /data or manually create one by copying from LLDAP repository"
+     exit 1
+  fi
+fi
+
+echo "> Starting lldap.."
+echo ""
+exec /app/lldap "$@"
+exec "$@"