[server] Support for changing server port (#7131)

## Description
Ref: https://github.com/ente-io/ente/issues/7122

## Tests
Tested locally

server/cmd/museum/main.go

@@ -858,7 +858,12 @@ func runServer(environment string, server *gin.Engine) {
 
 		log.Fatal(server.RunTLS(":443", certPath, keyPath))
 	} else {
-		server.Run(":8080")
+		port := 8080
+		if viper.IsSet("http.port") {
+			port = viper.GetInt("http.port")
+		}
+		log.Infof("starting server on port %d", port)
+		server.Run(fmt.Sprintf(":%d", port))
 	}
 }
 

server/configurations/local.yaml

@@ -71,8 +71,13 @@ log-file: ""
 
 # HTTP connection parameters
 http:
-    # If true, bind to 443 and use TLS.
-    # By default, this is false, and museum will bind to 8080 without TLS.
+    # The port to bind to.
+    # If not specified, defaults to 8080 (HTTP) or 443 (HTTPS with use-tls: true)
+    # port: 8080
+
+    # If true, use TLS for HTTPS connections.
+    # When true and port is not specified, defaults to port 443.
+    # When false and port is not specified, defaults to port 8080.
     # use-tls: true
 
 # Specify the base endpoints for various apps