rgw: asio/beast add ssl hot-reload

Adds the `ssl_reload` config option to the beast frontend.
This sets an interval in seconds to periodically reload the ssl context to pick up changes without restarting. It can be disabled (default) be setting it to `0`.

Fixes: 65470
Signed-off-by: Henry Richter <[email protected]>

Author: henrichter

doc/radosgw/frontends.rst

@@ -64,6 +64,17 @@ Options
 :Type: String
 :Default: None
 
+``ssl_reload``
+
+:Description: Optional interval in seconds to periodically recreate the SSL
+              context, which reloads the SSL certificate and private key from
+              their specified paths. A value of ``0`` disables this feature.
+              The reload is non-disruptive to existing connections. If the re-
+              load fails, the previous context continues to be used.
+
+:Type: Integer
+:Default: 0
+
 ``ssl_options``
 
 :Description: Optional colon separated list of SSL context options: