add mechanical image

Author: dipinknair

.github/workflows/geometry-mechanical-dpf.yml

@@ -88,17 +88,24 @@ jobs:
       fail-fast: false
       matrix:
         ansys-release: [24.1.0, 24.2]
+    container:
+        image: 'ghcr.io/ansys/mechanical:${{ matrix.ansys-release }}'
+        options: --entrypoint /bin/bash
     steps:
 
       - name: Checkout code
         uses: actions/checkout@v4
         with:
           sparse-checkout: 'geometry-mechanical-dpf'
 
-      - name: Set up Python ${{ env.MAIN_PYTHON_VERSION }}
-        uses: actions/setup-python@v5
-        with:
-          python-version: ${{ env.MAIN_PYTHON_VERSION }}
+      - name: Set up Python
+        run: |
+            apt update
+            apt install --reinstall ca-certificates
+            apt install software-properties-common -y
+            add-apt-repository ppa:deadsnakes/ppa -y
+            apt install -y python${{ env.MAIN_PYTHON_VERSION }} python${{ env.MAIN_PYTHON_VERSION }}-venv
+            python${{ env.MAIN_PYTHON_VERSION }} -m venv /env
 
       - name: Install dependencies
         run: |