Your PHP installation appears to be missing the MySQL extension which is required by WordPress. code example

Example 1: install php mysql extension ubuntu

sudo apt-get install php7.2-mysql

Example 2: - The requested PHP extension ext-http * is missing from your system. Install or enable PHP's http extension.

find "ext-http": "*" in  composer.json and remve it

Example 3: Your PHP installation appears to be missing the MySQL extension which is required by WordPress.

Your PHP installation appears to be missing the MySQL extension which is required by WordPress.