message: skip new relic for php 7.3; it won't be supported until agent 8.5.
diff: @@ -72,7 +72,9 @@ RUN apk update \
  && sed -i '1s/^/;Intentionally disabled. Enable via setting env variable XDEBUG_ENABLE to true\n;/' /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini \
  && rm -rf /var/cache/apk/* /tmp/pear/ \
  && apk del .phpize-deps \
  - && mkdir -p /tmp/newrelic && cd /tmp/newrelic \
  +
  + && if [ ${PHP_VERSION%.*} != "7.3" ]; then \
  + mkdir -p /tmp/newrelic && cd /tmp/newrelic \
  && wget https://download.newrelic.com/php_agent/archive/${NEWRELIC_VERSION}/newrelic-php5-${NEWRELIC_VERSION}-linux-musl.tar.gz \
  && gzip -dc newrelic-php5-${NEWRELIC_VERSION}-linux-musl.tar.gz | tar --strip-components=1 -xf - \
  && NR_INSTALL_USE_CP_NOT_LN=1 ./newrelic-install install \
  @@ -84,7 +86,8 @@ RUN apk update \
  && sed -i -e "s/newrelic.logfile = .*/newrelic.logfile = \"\/dev\/stdout\"/" /usr/local/etc/php/conf.d/newrelic.ini \
  && sed -i -e "s/newrelic.daemon.logfile = .*/newrelic.daemon.logfile = \"\/dev\/stdout\"/" /usr/local/etc/php/conf.d/newrelic.ini \
  && mv /usr/local/etc/php/conf.d/newrelic.ini /usr/local/etc/php/conf.d/newrelic.disable \
  - && cd / && rm -rf /tmp/newrelic \
  + && cd / && rm -rf /tmp/newrelic; \
  + fi \
  && mkdir -p /app \
  && fix-permissions /usr/local/etc/ \
  && fix-permissions /app \
  