Add GitHub 32bit aware runner

[siad007]

To ensure max errors by a GitHub actions workflow step, we need another env for the tests.

• Add another base test image to actions matrix build (32 bit)

Related to phingofficial/guide#50

[mrook]

Github doesn't offer 32 bit runners. So in order to get this working, we would have to use a self-hosted runner. That doesn't seem productive.

[twoseascharlie]

Well, my specifiic use case was running on a raspberry pi system (32-bit arm). Raspberry pi has recently offered an officially supported 64-bit OS. So I would be fine just dropping this one, especially if you haven't had anyone else raise the issue.

It may be worth mentioning in the Phing documentation that users of 32-bit systems may run into issues though?

[mrook]

We'll do that. Closing this one, thanks for your comments & suggestions @twoseascharlie .