feat: use go embed for swagger (#15216)

server/swagger.go

@@ -1,14 +1,13 @@
 package server
 
 import (
-	"fmt"
+	"io/fs"
 	"net/http"
 
-	"github.com/cosmos/cosmos-sdk/client"
 	"github.com/gorilla/mux"
-	"github.com/rakyll/statik/fs"
 
-	_ "github.com/cosmos/cosmos-sdk/client/docs/statik" // we use this to help with sderving the docs
+	"github.com/cosmos/cosmos-sdk/client"
+	"github.com/cosmos/cosmos-sdk/client/docs"
 )
 
 // RegisterSwaggerAPI provides a common function which registers swagger route with API Server
@@ -17,12 +16,12 @@ func RegisterSwaggerAPI(_ client.Context, rtr *mux.Router, swaggerEnabled bool)
 		return nil
 	}
 
-	statikFS, err := fs.New()
+	root, err := fs.Sub(docs.SwaggerUI, "swagger-ui")
 	if err != nil {
-		return fmt.Errorf("failed to create filesystem: %w", err)
+		return err
 	}
 
-	staticServer := http.FileServer(statikFS)
+	staticServer := http.FileServer(http.FS(root))
 	rtr.PathPrefix("/swagger/").Handler(http.StripPrefix("/swagger/", staticServer))
 
 	return nil