OP-289: Add running unit tests to build

Author: hmfilar

.github/workflows/build.yml

@@ -57,8 +57,11 @@ jobs:
       - name: Validate database schema
         run: (cd tests/Application && bin/console doctrine:schema:validate)
 
-      - name: Run PHPUnit
-        run: vendor/bin/phpunit --colors=always
+      - name: Run API tests
+        run: vendor/bin/phpunit tests/Api --colors=always
+
+      - name: Run PHPUnit tests
+        run: vendor/bin/phpunit tests/Unit --colors=always
 
       - name: Run Behat
         run: vendor/bin/behat --colors --strict -vvv --no-interaction || vendor/bin/behat --colors --strict -vvv --no-interaction --rerun