* Updating WP, WooCommerce and BTCPay Plugin.
* Ensure correct target platform.
* Make sure database host extraction works with host only; adding debugging code to better understand what's going on.
* Update to latest WooCommerce release.
* Make sure correct arch set on old image.
* Bumping WP to 2.8.3 and WooCommerce to 10.2.2
Transfered what we had in the docker-woocommerce repository, which is now archived.
This contains what has been merged with btcpayserver/docker-woocommerce#7 and sets everything up for a new 3.1.0 release of the image, which now also has an `arm64v8` compatible version. Previously this was `amd64` only.
