Add godot ci plugin.

godot/Dockerfile

@@ -0,0 +1,7 @@
+FROM flashlight13/godot:4.3
+
+ENV PLUGIN_SOURCE=.
+ENV PLUGIN_TARGET
+ENV PLUGIN_EXPORT_TEMPLATE="Windows Desktop"
+
+RUN godot --headless --path "$PLUGIN_SOURCE" --export-release "$PLUGIN_SOURCE" "$PLUGIN_TARGET"