[Feature Request] Support custom vendor folder location

[hirasso]

First of all: Thank you for this package ❤️

If config.vendor-dir is set to a custom location, the prefix-namespaces script fails with this cryptic error:

[info] Loading composer.json config...
[info] Loading cli config...
[info] Building dependency list...
[info] Enumerating files...
[error] Unable to read file from location: vendor/Repos/rh-admin-utils/keys.dev.pub. file_get_contents(/Users/rah/Documents/Repos/rh-admin-utils/vendor/Repos/rh-admin-utils/keys.dev.pub): Failed to open stream: No such file or directory
Script @php bin/strauss.phar handling the prefix-namespaces event returned with error code 1
Script @prefix-namespaces was called via post-install-cmd

I can't make any sense of this. Some observations:

• vendor/Repos/rh-admin-utils seems to be somehow related to the path where my plugin is located on my local disc.
• keys.dev.pub is not in my package nor does it seem to exist anywhere in strauss

My composer.json

{
  "name": "hirasso/rh-admin-utils",
  "description": "A WordPress utility plugin 🥞",
  "license": "GPL-2.0-or-later",
  "config": {
    "vendor-dir": "./lib/vendor"
  },
  "autoload": {
    "psr-4": {
      "RH\\AdminUtils\\": "lib/rh-admin-utils"
    }
  },
  "type": "wordpress-plugin",
  "minimum-stability": "dev",
  "require": {
    "php": ">=8.2",
    "symfony/var-dumper": "^7.1"
  },
  "scripts": {
      "prefix-namespaces": [
          "sh -c 'test -f ./bin/strauss.phar || curl -o bin/strauss.phar -L -C - https://github.com/BrianHenryIE/strauss/releases/latest/download/strauss.phar'",
          "@php bin/strauss.phar",
          "@php composer dump-autoload"
      ],
      "post-install-cmd": [
          "@prefix-namespaces"
      ],
      "post-update-cmd": [
          "@prefix-namespaces"
      ]
  },
  "require-dev": {
    "squizlabs/php_codesniffer": "*"
  }
}

If I remove the config.vendor-dir config entry, it works. No big deal but this might point to a bigger issue with relative paths (maybe a missing ./ somewhere?)