AVIF encoding not working in WordPress Docker images due to missing recommended dependency

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The WordPress Docker images cannot encode AVIF images using ImageMagick/Imagick, despite having AVIF decoding support. This occurs because the libheif-plugin-aomenc package (the AVIF encoder) is removed when recommended packages are stripped from the image.

When attempting to convert images to AVIF format using Imagick, the following error occurs:

no encode delegate for this image format `AVIF' @ error/constitute.c/WriteImage/1412

The queryFormats check passes for "AVIF" because the decoder is present, but encoding fails.

The issue seems to stem from the Dockerfile template's package installation process:

1. libmagickwand-dev is installed at:
   

   wordpress/Dockerfile.template

   Line 66 in 4eb711d

   libmagickwand-dev \

2. Recommended packages are removed at:
   

   wordpress/Dockerfile.template

   Line 124 in 4eb711d

   apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \

Dependency chain:

• libmagickwand-dev depends on libmagickcore-7.q16-dev
  (ref: https://packages.debian.org/trixie/libmagickwand-7.q16-dev)

• libmagickcore-7.q16-dev depends on libmagickcore-7.q16-10
  (ref: https://packages.debian.org/trixie/libmagickcore-7.q16-dev)

• libmagickcore-7.q16-10 depends on libheif1
  (ref: https://packages.debian.org/trixie/libmagickcore-7.q16-10)

• libheif1 depends on libheif-plugin-dav1d or libheif-plugin-aomdec
  (ref: https://packages.debian.org/trixie/libheif1)

Here, libheif-plugin-dav1d is the decoder and is a hard dependency and libheif-plugin-aomdec is a encoder but it is a recommended dependency (ref: https://packages.debian.org/trixie/libheif1). It is not included in the WordPress Docker image because recommended packages are removed, causing the loss of encoder.

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@yosifkit, is there any reason the PHP 8.1 images were not updated? They are having the same issue, while PHP 8.1+ has been fixed.

Okay so the support is dropped for PHP 8.1 #992.

For context see: https://github.com/WordPress/performance/actions/runs/21961752009/job/63442055909?pr=2245