install desimodel for tests

.github/workflows/python-package.yml

@@ -24,6 +24,7 @@ jobs:
         numpy-version: ['<1.20', '<1.21', '<1.22']
         scipy-version: ['<1.6', '<1.7']
         speclite-version: ['==0.19']
+        desiutil-version: ['3.4.2']
 
     steps:
       - name: Checkout code
@@ -44,6 +45,9 @@ jobs:
           python -m pip install 'astropy${{ matrix.astropy-version }}'
           python -m pip install 'numpy${{ matrix.numpy-version }}'
           python -m pip install 'speclite${{ matrix.speclite-version }}'
+          python -m pip install git+https://github.com/desihub/desiutil.git@${{ matrix.desiutil-version }}
+          python -m pip install git+https://github.com/desihub/[email protected]
+
       - name: Run the test
         run: pytest
 
@@ -54,7 +58,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.8]
+        python-version: [3.9]
 
     steps:
       - name: Checkout code
@@ -72,6 +76,8 @@ jobs:
           python -m pip install --upgrade pip wheel setuptools
           python -m pip install pytest pytest-astropy coveralls
           python -m pip install pyyaml numpy\<1.21 scipy\<1.6 astropy\<5.0 speclite==0.19
+          python -m pip install git+https://github.com/desihub/[email protected]
+          python -m pip install git+https://github.com/desihub/[email protected]
 
       - name: Run the test with coverage
         run: pytest --cov