Move the php unit tests to Github actions

[youknowriad]

This is the first Github action workflow that is going to need a wp-env environment. Let's see how it goes :)

[github-actions]

Size Change: 0 B

Total Size: 1.13 MB

ℹ️ View Unchanged

Filename	Size	Change
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build/annotations/index.js	3.62 kB	0 B
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build/deprecated/index.js	772 B	0 B
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build/format-library/style-rtl.css	547 B	0 B
build/format-library/style.css	548 B	0 B
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build/list-reusable-blocks/style.css	451 B	0 B
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build/priority-queue/index.js	788 B	0 B
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build/warning/index.js	1.14 kB	0 B
build/wordcount/index.js	1.17 kB	0 B

_{compressed-size-action}

[youknowriad]

Seems like the PHP unit tests are passing properly and they took 1 minute less than travis.