Push Docker image to self-hosted registry

Steps on building a Docker image and pushing it to a self-hosted registry:

1. Build the Docker image using docker build.
2. Run docker login to log in to the registry.
3. Tag the image to the registry using docker tag.
4. Push the image to the registry using docker push.

Putting it together in an example:

# Build the image
docker build -t app:1.0.0 .

# Log into the registry
docker login example.com

# Tag the image to the registry
docker tag app:1.0.0 example.com/app:1.0.0

# Push the image to the registry
docker push example.com/app:1.0.0

This will create an image with the name example.com/app:1.0.0 being pushed to the registry.