Merge pull request #987 from hedrok/docker-build-add-apt-update

Docker: T7568: add apt-get update as last command

Author: jestabro

docker/Dockerfile

@@ -334,6 +334,9 @@ RUN rm -rf /tmp/*
 # Remove cleanup script so that in-container apt-get install uses cache
 RUN rm /etc/apt/apt.conf.d/clean
 
+# Add cache once as it is needed by some builds in GitHub Actions
+RUN apt-get update
+
 # Disable mouse in vim
 RUN printf "set mouse=\nset ttymouse=\n" > /etc/vim/vimrc.local