Commits on Jun 26, 2024

1. doc(README): Make shell snippet copy&paste safe …

   Many bash/shell snippets in the README use an environment variable
   `YOUR_CONTAINER_REGISTRY`, which is used as `$YOUR_CONTAINER_REGISTRY`.
   
   However, that has the downside that if users copy & paste the snippet
   and accidentally press enter or use a shell that doesn't allow multi-
   line pasting (and executes it immediately), then the variable will be
   replaced by an empty string, because it wasn't set before.
   
   It's good practice to make those snippets copy&paste-safe.
   We can achieve that by adding `:?` to the variable, which emits an
   error if the variable is unset or null.
   
   See https://devhints.io/bash for a bash cheat sheet.
   
   Example:
   
   ```sh
   docker push ${YOUR_CONTAINER_REGISTRY:?}/bookshop-srv
   ```
   
   On ZSH:
   
   ```
   zsh: YOUR_CONTAINER_REGISTRY: parameter not set
   ```
   
   On Bash:
   
   ```
   bash: YOUR_CONTAINER_REGISTRY: parameter null or not set
   ```

   

   bugwelle committed Jun 26, 2024
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