AVIF was introduced in PHP 8.1, appears that even the Drupal + PHP 8.3 images are missing it
docker run --user root -ti drupal:11-php8.3-apache-bookworm bash -c 'php -i| grep PNG -C10'
GD Support => enabled
GD Version => bundled (2.1.0 compatible)
FreeType Support => enabled
FreeType Linkage => with freetype
FreeType Version => 2.12.1
GIF Read Support => enabled
GIF Create Support => enabled
JPEG Support => enabled
libJPEG Version => 6b
PNG Support => enabled
libPNG Version => 1.6.39
WBMP Support => enabled
XBM Support => enabled
WebP Support => enabled
BMP Support => enabled
TGA Read Support => enabled
AVIF was introduced in PHP 8.1, appears that even the Drupal + PHP 8.3 images are missing it