feat(jupyterhub): admin vault token renewal

jupyterhub/vault-agent-config.gomplate.hcl

@@ -0,0 +1,38 @@
+vault {
+  address = "{{ .Env.VAULT_ADDR }}"
+}
+
+# Enable detailed logging
+log_level = "{{ .Env.VAULT_AGENT_LOG_LEVEL }}"
+log_format = "standard"
+
+auto_auth {
+  method "kubernetes" {
+    mount_path = "auth/kubernetes"
+    config = {
+      role = "jupyterhub"
+    }
+  }
+
+  sink "file" {
+    config = {
+      path = "/vault/secrets/vault-token"
+    }
+  }
+}
+
+cache {
+  use_auto_auth_token = true
+}
+
+listener "tcp" {
+  address     = "127.0.0.1:8100"
+  tls_disable = true
+}
+
+# Add template for token monitoring
+template {
+  source      = "/vault/config/token-monitor.tpl"
+  destination = "/vault/secrets/token-info.log"
+  perms       = 0644
+}