"Fix matrix OS variable usage in GitHub workflows

Updated PHPUnit.yml to correctly reference the MATRIX_OS environment variable in the 'command' field, ensuring proper output filenames for coverage and test results. Modified RunCommandOnMatrix.yml to explicitly set the MATRIX_OS variable in the environment, guaranteeing consistent and accurate variable access across workflow steps."

Author: dieselxxx

.github/workflows/RunCommandOnMatrix.yml

@@ -49,4 +49,6 @@ jobs:
       - name: Install composer dependencies
         run: composer install --no-interaction --no-progress --prefer-dist
       - name: ${{ inputs.title }}
-        run: ${{ inputs.command }}
+        run: ${{ inputs.command }}
+        env:
+          MATRIX_OS: ${{ matrix.operating-system }}