Description

While running a deployment via gitlab-ci the latest base image craftcms/nginx:8.0 was pulled from Docker Hub.
The subsequent composer install failed because several PHP extensions were suddenly missing.
Has there been a change in the base image that caused this?

How could we possibly avoid changes like that? Is there a versioning in place so we can set fixed versions for the base images we use?

Problem 1
- Root composer.json requires PHP extension ext-simplexml * but it is missing from your system. Install or enable PHP's simplexml extension.

Problem 2
- craftcms/cms is locked to version 3.7.28 and an update of this package was not requested.
- craftcms/cms 3.7.28 requires ext-dom * -> it is missing from your system. Install or enable PHP's dom extension.

Steps to reproduce

1. Create a Dockerfile which pulls the base image craftcms/nginx:8.0
2. Run composer install

Additional info

• Craft version: 3.7.x
• PHP version: 8.0
• Database driver & version: mysql
• Plugins & versions: n/a