Ensure python and pipx are installed

.github/actions/setup-mako/action.yml

@@ -9,7 +9,21 @@ runs:
         echo "mako=$(realpath '${{ github.action_path }}/../../../')" >> $GITHUB_OUTPUT
       shell: bash
 
-    - run: pipx install poetry
+    - uses: actions/setup-python@v4
+      with:
+        cache: 'poetry'
+
+    - name: Ensure pipx is available
+      run: |
+        if ! command -v pipx > /dev/null 2>&1; then
+        echo "$HOME/.local/bin" >> $GITHUB_PATH
+        python3 -m pip install --user pipx
+        python3 -m pipx ensurepath
+        fi
+      shell: bash
+
+    - name: Install poetry
+      run: pipx install poetry
       shell: bash
 
     - run: |