Add properly standalone version with bundled PHP

[emmadesilva]

Inspired by https://x.com/marcelpociot/status/1498244220620099588

[emmadesilva]

Update https://x.com/pronskiy/status/1806321754404446217

See https://github.com/pronskiy/phpup/blob/main/build.sh and pronskiy/conductor@7a95578#diff-a2148afebd710bc0faae45bb2036aaa74c2e9f6437d1b491298bba1b01f9a576