Update drogon.dockerfile silent

Author: joanhey

frameworks/C++/drogon/drogon.dockerfile

@@ -33,7 +33,7 @@ ENV TEST_PATH=/drogon_benchmark/build
 WORKDIR $IROOT
 
 RUN sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'
-RUN wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc --quiet | sudo apt-key add -
+RUN wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
 RUN sudo apt -y update  > /dev/null
 RUN sudo apt -y install postgresql-server-dev-all > /dev/null