Manually push to GitHub Container registry with Docker login

Today I wanted to manually push a Docker image I built locally to my github container registry for debugging purposes. I built the image like so docker build --pull --tag ghcr.io/jonathanschwarzhaupt/lab-airflow:v0.0.1 . Important to not forget the dot in the end to indicate that the Dockerfile resides in the current directory. I had issues pushing the image to ghcr.io, however. I confirmed that I was logged in as the correct user through ...