feat: add script to apply DNS manifests via SSH to cluster nodes

scripts/apply_dns_updates.py

@@ -10,13 +10,9 @@ def apply_manifest(host, local_file):
     client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
     client.connect(host, username="root", key_filename=SSH_KEY, timeout=10)
     
-    # Write to remote /tmp/dns-stack.yaml and kubectl apply
-    sftp = client.open_sftp()
-    with sftp.open("/tmp/dns-stack.yaml", "w") as f:
-        f.write(manifest_content)
-    sftp.close()
-    
-    stdin, stdout, stderr = client.exec_command("k3s kubectl apply -f /tmp/dns-stack.yaml")
+    stdin, stdout, stderr = client.exec_command("k3s kubectl apply -f -")
+    stdin.write(manifest_content)
+    stdin.close()
     out = stdout.read().decode()
     err = stderr.read().decode()
     client.close()