Install python 3 in CentOS CI container

Author: code-asher

.github/workflows/ci.yaml

@@ -258,6 +258,11 @@ jobs:
         with:
           node-version: "16"
 
+      - name: Install Python 3
+        uses: actions/setup-python@v3
+        with:
+          python-version: "3.x"
+
       - name: Install development tools
         run: |
           yum install -y epel-release centos-release-scl