Docker RUN cleans cache code example

Example 1: docker clear cache

# Rebuild the image
docker build --no-cache

# Pull the base images again and rebuild
docker build --no-cache --pull

# Also works with docker-compose
docker-compose build --no-cache

# If nothing of the above works for you, you could also prune everything
docker system to prune

Example 2: docker force a rebuild

docker build --no-cache -t u12_core -f u12_core .