Use R2 URL for ext-relay (mlocati#676)

Fix xdebug with PHP 7.2/7.3/7.4, xdebug 3.2 GA (mlocati#671)

Upgrade ion-c from v1.0.6 to v1.1.0 (mlocati#669)

[Alpine] Update libgearman from v1.1.19.1 to v1.1.20 (mlocati#661)

Fix installing zstd on PHP 5.x (mlocati#664)

[skip ci] Automatically update README.md

Fix xdebug on PHP 8.2 (mlocati#655)

Use pre-compiled system libraries for GD AVIF support on Alpine 3.15+ (…

…mlocati#653)

[skip ci] Automatically update README.md

using length instead of count for php < 7.2 compatibility (mlocati#643)