Any recommendations on how I can support adding indicator for anonymous user or user without access to toolbar

I've gone ahead and created a submodule, environment_indicator_block. If the maintainers rather this as a separate module please let me know.

One outstanding question, I am managing my indicator values through hardcoding them in the settings file:

# Site environment
$config['environment_indicator.indicator']['name'] = 'LOCAL';
$config['environment_indicator.indicator']['bg_color'] = '#8A1350';
$config['environment_indicator.indicator']['fg_color'] = '#FFFFFF';

For my setup, it doesn't seem like I need to add any cacheable metadata to the block because it will require a cache rebuild to get the overrides, right? What would be a good way to future proof it a bit?

Here are some screenshots of the block in action