add a settings entry for nr of random videos to display

apiGo/database/migrations/20220505195845_randomnr.sql

@@ -0,0 +1,11 @@
+-- +goose Up
+-- +goose StatementBegin
+alter table settings
+    add random_nr int default  3 null;
+-- +goose StatementEnd
+
+-- +goose Down
+-- +goose StatementBegin
+alter table settings
+    drop random_nr;
+-- +goose StatementEnd