GH Actions: allow test runs to succeed on fork

As things were, test runs on forks (when the `master` branch in the fork is updated) would always fail on the "upload code coverage reports" step, as forks (justifiably) don't have access to the `CODECOV_TOKEN`.

Fixed now by adding a condition for running that step and for efficiency, adding the same condition to the steps running the tests.

Author: jrfnl

.github/workflows/php-qa.yml

@@ -65,16 +65,16 @@ jobs:
               run: ./vendor/bin/phpunit --migrate-configuration
 
             - name: Run unit tests (without code coverage)
-              if: ${{ matrix.php-versions != '7.4' || matrix.dependency-versions != 'highest' }}
+              if: ${{ matrix.php-versions != '7.4' || matrix.dependency-versions != 'highest' || github.event.repository.fork == true }}
               run: ./vendor/bin/phpunit
 
             - name: Run unit tests with code coverage
-              if: ${{ matrix.php-versions == '7.4' && matrix.dependency-versions == 'highest' }}
+              if: ${{ matrix.php-versions == '7.4' && matrix.dependency-versions == 'highest' && github.event.repository.fork == false }}
               run: ./vendor/bin/phpunit --coverage-clover=coverage.xml
 
             - name: Update codecov.io
               uses: codecov/codecov-action@v5
-              if: ${{ matrix.php-versions == '7.4' && matrix.dependency-versions == 'highest' }} # upload coverage once is enough
+              if: ${{ matrix.php-versions == '7.4' && matrix.dependency-versions == 'highest' && github.event.repository.fork == false }} # upload coverage once is enough
               env:
                 CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
               with: