Add source directory configuration for coverage

[kynx]

Q	A
House Keeping	yes

Description

Add <source> to phpunit.xml.dist so --coverage doesn't moan with:

There was 1 PHPUnit test runner warning:

1) No filter is configured, code coverage will not be processed

There will be be around 65 PHPUnit warnings after this.

[tyrsson]

I approved this, but.... @kynx can you update this to use so that we get a little more fine-grained control. We are requiring coverage via attributes for all classes / methods.

Ok, scratch that. It will need to be configured in the phpunit.xml override file so that we do not get failures in the action runs. Carry on.

[kynx]

@tyrsson This PR just enables PHPUnit to collect coverage data. If you want to enforce it, you should add the following to phpunit.xml.dist:

         requireCoverageMetadata="true"
         beStrictAboutCoverageMetadata="true"

That will result in 619 warnings, which I do not have the time or energy to tackle right now.

[tyrsson]

The docker container would need xdebug.