Modified `pipx` executable for use within a Flatpak environment, setting up necessary environment variables to isolate `pipx` from the host system. Replace the content of `pipx` with `pipx-bin.py`.

pipx-bin.py

#!/usr/bin/python
# -*- coding: utf-8 -*-
import re
import os
import sys

if __name__ == '__main__':
    BASE_DIR = f'{os.environ['HOME']}/.var/app/com.vscodium.codium-insiders'

    os.environ['PIPX_HOME'] = f'{BASE_DIR}/data/pipx'
    os.environ['PIPX_BIN_DIR'] = f'{BASE_DIR}/data/python/bin' # This path is already in your PATH
    os.environ['PIPX_MAN_DIR'] = f'{BASE_DIR}/.local/share/man' # You might need to create this path

    from pipx.main import cli
    sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0])
    sys.exit(cli())