Updating gitea workers and adding gdunit4 and fake test.

tests/run_tests.gd

@@ -0,0 +1,5 @@
+extends SceneTree
+
+func _ready() -> void:
+    var result := GdUnit4Runner.run_in_current_scene([], false)
+    quit(result.exit_code)

tests/test_wave_config.gd

@@ -0,0 +1,8 @@
+extends GdUnitTest
+
+func setUp() -> void:
+    pass # runs before each test case
+
+func test_something_basic() -> void:
+    var value := 42
+    assertEquals(42, value)