Add docker test env back into testing matrix

.github/workflows/PackageTest.yml

@@ -14,17 +14,27 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ "3.8", "3.9", "3.10", "3.11" ]
+        slurm_version:
+          - 20.11.9.1
+          - 22.05.2.1
+          - 23.02.5.1
+        python_version:
+          - 3.8
+          - 3.9
+
+    container:
+      image: ghcr.io/pitt-crc/test-env:${{ matrix.slurm_version }}
+      credentials:
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
 
     steps:
+      - name: Setup environment
+        run: /usr/local/bin/entrypoint.sh
+
       - name: Checkout repository
         uses: actions/checkout@v4
 
-      - name: Setup Python
-        uses: actions/setup-python@v4
-        with:
-          python-version: ${{ matrix.python-version }}
-
       - name: Install Poetry
         uses: snok/install-poetry@v1
         with: