Docker image building is quite by default with the new build kit. This hides long install output, but can also mean you echo commands for debuggin don’t appear.

Here are changes to make, based on SO answers.

Progress

$ docker build --progress plain

  --progress string         Set type of progress output (auto, plain, tty). Use plain to show container output

Or

$ export BUILDKIT_PROGRESS=plain

Use the classic build engine

Turn off the new buildkit.

$ DOCKER_BUILDKIT=0 docker build