fix(entrypoint): allow to create a dir and file with a single variable

docker/entrypoint.sh

@@ -90,8 +90,7 @@ fi
 # Users have to opt-in to additional functionality by setting environmental variables.
 if [[ -n "${ZEBRA_CONF_PATH}" ]] && [[ ! -f "${ZEBRA_CONF_PATH}" ]] && [[ -z "${ENTRYPOINT_FEATURES}" ]]; then
   # Create the conf path and file
-  mkdir -p "${ZEBRA_CONF_DIR}" || { echo "Error creating directory ${ZEBRA_CONF_DIR}"; exit 1; }
-  touch "${ZEBRA_CONF_PATH}" || { echo "Error creating file ${ZEBRA_CONF_PATH}"; exit 1; }
+  (mkdir -p "$(dirname "${ZEBRA_CONF_PATH}")" && touch "${ZEBRA_CONF_PATH}") || { echo "Error creating file ${ZEBRA_CONF_PATH}"; exit 1; }
   # Populate the conf file
   cat <<EOF > "${ZEBRA_CONF_PATH}"
 [network]