What was going on
docker run --rm cgr.dev/chainguard/php:8.2-fpm-dev fails immediately because the entrypoint calls a wrong directory, the php-fpm entrypoint path in the image does not exist, so the container exits.
What fixed it
This was an image packaging bug and the entrypoint path has been fixed in the current php image, the reporter confirmed the corrected path. Pull the latest cgr.dev/chainguard/php image and the container starts. (A separate request for a pecl extension was redirected to the Wolfi package-request template, since Wolfi is the package source.)