Adds AWS extension and auto-configuration settings

[vedmaka]

Adds https://www.mediawiki.org/wiki/Extension:AWS and configuration support. Introduces the following ENV variables:

• AWS_IMAGES_BUCKET bucket name to store the images
• AWS_IMAGES_ACCESS access key
• AWS_IMAGES_SECRET secret key
• AWS_IMAGES_REGION region
• AWS_IMAGES_BUCKET_DOMAIN - (optional) custom domain to serve the images, i.e. $1.s3.eu-west-2.amazonaws.com where $1 is replaced by the extension to the bucket name
• AWS_IMAGES_PRIVATE - (optional) (default false) set to true to enable private images for private wikis
• AWS_IMAGES_ENDPOINT - (optional) custom S3 endpoint URL
• AWS_IMAGES_SUBDIR - (optional) subdirectory to use on the S3 bucket
• AWS_IMAGES_USEPATH - (optional) if set forces to use path-style instead of subdomain-style endpoint URL

If the AWS_IMAGES_BUCKET is set the AWS extension is automatically loaded and enabled

[github-actions]

🐳 The image based on 2ef1cd07 commit has been built with 1.39.11-20250707-509 tag as ghcr.io/canastawiki/canasta:wikiteq-2ef1cd07