Add DNS and Python environment diagnostics to SSL tests workflow and fix RST license link syntax

Author: chenyunliang520

.github/workflows/tests-ssl.yml

@@ -228,6 +228,7 @@ jobs:
 
       - name: Print DNS and Python environment
         run: |
+          source venv/bin/activate
           python - << 'EOF'
           import asyncio
           import dns