Add Azure deployment examples and enhance configuration management

- Update .gitignore to exclude Terraform files
- Enhance README with Azure deployment instructions
- Refactor publish.sh to use a container for changelog parsing
- Add Azure example files including Terraform configurations
- Create cloud-init templates for PKI and default configurations
- Implement workload VM setup for testing routing

README.md

@@ -71,7 +71,8 @@ from the internal NIC instead; with `mode = auto` the interface names go too.
 Alternatively write `/etc/vpn-router/vpn-router.conf` directly before or after installing.
 A configuration-management tool should do that and then restart `vpn-router-setup`.
 
-See [examples/](examples/) for a cloud-init template and a shell installer.
+See [examples/](examples/) for a cloud-init template and a shell installer, and
+[examples/azure/](examples/azure/) for a full Terraform example that deploys a router on Azure.
 
 ## Configuration