Fedora image for mdBook-based generation

This Fedora container image contains:

• mdBook: https://github.com/rust-lang/mdBook
  create book from markdown files, like Gitbook
• mdBook preprocessor: https://crates.io/crates/mdbook-callouts
  to add Obsidian Flavored Markdown's Callouts

Usage instructions

Start the container in the folder that contains your documentation source

$ podman run --rm -v $PWD:/workspace \
    ghcr.io/gbraad-redhat/mdbook:0.4.42 \
    mdbook build

This will generate a book output.

Or using

$ podman run --rm -v $PWD:/workspace -p 3000:3000 \
    ghcr.io/gbraad-redhat/mdbook:0.4.42 \
    mdbook serve

the generated content will be published using the embedded server on http://localhost:3000