Trying to extend Dockerfile, can't install using apt-get getting permission denied

The community member is having trouble installing packages in a Dockerfile, encountering either permission denied errors when running apt-get install or no sudo command available. Another community member suggests dropping into the root user to perform the installation using USER root, and then switching back to the regular user. Additionally, a reference is made to a base Dockerfile from the apify/apify-actor-docker repository, which may provide a solution.