Ability to set default_user_name from ENV

[jetersen]

Prerequisites

• [x] I have read and understand the CONTRIBUTING guide
• [x] I looked for duplicate issues before submitting this one

Description

This feature was supported in v2 https://github.com/jetersen/dotfiles/blob/7f2f4e241c29d59699a85a2f20186207cf6224aa/powershell/profile.ps1#L5

I would prefer to have the ability to set default username via USERNAME when the prompt is setup instead of hardcoding a fixed username in the json theme file. When using display_default: false

Environment

• Oh my Posh version: 3.96.0
• Theme: custom theme based on JanDeDobbeleer (will add it to my dotfiles later)
• Operating System: Windows 10/Ubuntu 2004 (WSL)
• Shell: zsh/pwsh
• Terminal: Windows Terminal

Steps to Reproduce

        {
          "type": "session",
          "style": "diamond",
          "powerline_symbol": "",
          "invert_powerline": false,
          "foreground": "#ffffff",
          "foreground_templates": null,
          "background": "#c386f1",
          "background_templates": null,
          "leading_diamond": "",
          "trailing_diamond": "",
          "properties": {
            "display_host": false,
            "default_user_name": "joseph",
            "display_default": false
          }
        },

[github-actions[bot]]

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