Create a new docker buildx builder instance

Documented steps

1. Run 'docker buildx create' to create a builder from the current Docker default context; it prints the auto-generated builder name.
2. Point it at a specific context or endpoint: 'docker buildx create <context|endpoint>' where context comes from 'docker context ls' or endpoint is a Docker socket/address like the DOCKER_HOST value.
3. Give it a name and switch immediately: 'docker buildx create --name mybuilder --use' (or add --use which is the same as running 'docker buildx use $(docker buildx create ...)').
4. Choose a driver with --driver: docker (default, builder inside the Docker daemon), docker-container (a BuildKit container, needed for multi-platform and cache export), kubernetes (pods), or remote (externally managed BuildKit daemon).
5. Scope/limit platforms with --platform linux/amd64 or multiple like 'linux/arm64,linux/arm/v7'; manually-set platforms take priority over auto-detected ones (shown with an asterisk in buildx ls/inspect).
6. Add BuildKit daemon config with --buildkitd-config <file> (default lookups: $BUILDX_CONFIG/buildkitd.default.toml, $DOCKER_CONFIG/buildx/buildkitd.default.toml, ~/.docker/buildx/buildkitd.default.toml) or --buildkitd-flags for flags that override the file.
7. Append extra nodes to the same builder with --append <context>, or remove a node with --leave.
8. Official docs: https://docs.docker.com/reference/cli/docker/buildx/create/