Duplicated jobs without matrix strategy
=======================================

.. list-table::
   :stub-columns: 1
   :widths: 20 80

   * - Rule ID
     - ``no_matrix_strategy``
   * - Category
     - performance
   * - Severity
     - low

Multiple nearly-identical jobs differ only in a parameter (OS, Node version, etc.) but do not use a matrix strategy.

Detection
---------

``heuristic`` — Structural comparison across multiple jobs or steps.

Examples
--------

**Non-compliant:**

.. code-block:: yaml

   jobs:
     test-node-18:
       runs-on: ubuntu-latest
       steps:
         - uses: actions/setup-node@v4
           with: {node-version: 18}
         - run: npm test
     test-node-20:
       runs-on: ubuntu-latest
       steps:
         - uses: actions/setup-node@v4
           with: {node-version: 20}
         - run: npm test
     test-node-22:
       runs-on: ubuntu-latest
       steps:
         - uses: actions/setup-node@v4
           with: {node-version: 22}
         - run: npm test

**Compliant:**

.. code-block:: yaml

   jobs:
     test:
       runs-on: ubuntu-latest
       strategy:
         matrix:
           node-version: [18, 20, 22]
       steps:
         - uses: actions/setup-node@v4
           with:
             node-version: ${{ matrix.node-version }}
         - run: npm test

**Fix**: Replace duplicate jobs with a single job using strategy.matrix to iterate over the varying parameter.