Server: Reload TLS certs without a server restart (#83589)

* server: reload of grafana server certs when renewed without restart.

Signed-off-by: Rao, B V Chalapathi <b_v_chalapathi.rao@nokia.com>

* server: reload of grafana server certs when renewed without restart.

Signed-off-by: Rao, B V Chalapathi <b_v_chalapathi.rao@nokia.com>

* Update http_server.go

* Update docs/sources/setup-grafana/configure-grafana/_index.md

Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>

* Update http_server.go

Address the comments

* Update docs/sources/setup-grafana/configure-grafana/_index.md

Co-authored-by: Dan Cech <dan@aussiedan.com>

* Update http_server.go

Align the spaces

* Update http_server.go

* Update http_server.go

* Update pkg/api/http_server.go

Co-authored-by: Dan Cech <dan@aussiedan.com>

---------

Signed-off-by: Rao, B V Chalapathi <b_v_chalapathi.rao@nokia.com>
Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>
Co-authored-by: Dan Cech <dan@aussiedan.com>

conf/defaults.ini

@@ -66,6 +66,9 @@ enable_gzip = false
 cert_file =
 cert_key =
 
+# Certificates file watch interval
+certs_watch_interval =
+
 # Unix socket gid
 # Changing the gid of a file without privileges requires that the target group is in the group of the process and that the process is the file owner
 # It is recommended to set the gid as http server user gid

conf/sample.ini

@@ -67,6 +67,9 @@
 ;cert_file =
 ;cert_key =
 
+# Certificates file watch interval
+;certs_watch_interval =
+
 # Unix socket gid
 # Changing the gid of a file without privileges requires that the target group is in the group of the process and that the process is the file owner
 # It is recommended to set the gid as http server user gid