Add static file support w/ volume mount

[justsml]

Option No. 1:

Auto-enable if we find a path like /app/public or /var/lib/html?

Option No. 2:

Or for advanced functionality, try something like:

-e STATIC='{RequestPath}={For Matching Extensions}:{Static Files Local Path}'
-e STATIC='/public=js,css,htm,html,jpeg,jpg,png,gif,ico:/app/public'