Vualt token renew doesn't retry on failure

[ShayaSi]

If consul-template is configured to use vault token with a renew configuration, and the vault token renew fails once (for example the server is temporarily unreachable), it doesn't retry like intended.

2025-05-08T11:37:57.417Z [WARN] vault.token: failed to renew: context deadline exceeded
2025-05-08T11:37:57.417Z [WARN] vault.token: renewer done (maybe the lease expired)

After that it hangs.

Problem comes from the line:

consul-template/watch/view.go

Line 165 in 1adb94d

serverErrCh <- err

The channel that is being written isn't buffered and there is no one reading from that channel for the special vault token watcher:

consul-template/manager/runner.go

Line 85 in 1adb94d

vaultTokenWatcher *watch.Watcher