Move from CircleCI to GH Actions (#902)

* Copy CI files from https://github.com/pantheon-systems/example-wordpress-composer

Signed-off-by: Chris Abraham <cjyabraham@gmail.com>

* edit gh actions template

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* remove circleci stuff

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* move gha files to the right dir

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* fix path

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* try to store artifacts

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* only need the vendor artifact

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* Use a cache instead of an artifact

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* don't need this

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* try checking sniffs here

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* try this

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* test code sniffs

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* undo change

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* update

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* compile theme

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* test

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* t

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* try this

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* get lfasiallcci going

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* set var

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* get the vars right

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* Add badge to readme

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* Update readme and repo urls

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* try setting the "Details" link to the dev instance

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* That didn't seem to work

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* tidy up gitignore

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* Getting on to the latest versions of dependencies

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* try a different image for this

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* drop back a few versions on this one

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* try root access here

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Signed-off-by: Chris Abraham <cjyabraham@gmail.com>