message: a newer xdebug with php 7.3.
diff: @@ -51,7 +51,10 @@ RUN apk update \
  libxslt-dev \
  postgresql-dev \
  && apk add --no-cache --virtual .phpize-deps $PHPIZE_DEPS \
  - && if [ ${PHP_VERSION%.*.*} == "7" ]; then \
  + && if [ ${PHP_VERSION%.*} == "7.3" ]; then \
  + yes '' | pecl install -f apcu \
  + && yes '' | pecl install -f xdebug-2.7.0; \
  + elif [ ${PHP_VERSION%.*.*} == "7" ]; then \
  yes '' | pecl install -f apcu \
  && yes '' | pecl install -f xdebug; \
  fi \
  