Make tests more platform agnostic (#4650)

Use QTemporaryDir to create the test directory
Add option to use httpbin over local docker
Increase delay for opening a connection

Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

benchmarks/src/main.cpp

@@ -3,6 +3,7 @@
 #include <benchmark/benchmark.h>
 #include <QApplication>
 #include <QtConcurrent>
+#include <QTemporaryDir>
 
 using namespace chatterino;
 
@@ -12,12 +13,15 @@ int main(int argc, char **argv)
 
     ::benchmark::Initialize(&argc, argv);
 
-    // Ensure settings are initialized before any tests are run
-    chatterino::Settings settings("/tmp/c2-empty-mock");
+    // Ensure settings are initialized before any benchmarks are run
+    QTemporaryDir settingsDir;
+    settingsDir.setAutoRemove(false);  // we'll remove it manually
+    chatterino::Settings settings(settingsDir.path());
 
-    QtConcurrent::run([&app] {
+    QtConcurrent::run([&app, &settingsDir]() mutable {
         ::benchmark::RunSpecifiedBenchmarks();
 
+        settingsDir.remove();
         app.exit(0);
     });