Add Dockerfile for a toolbox dev environment

Dockerfile

@@ -0,0 +1,8 @@
+# Build a image for use with toolbox (https://containertoolbx.org/)
+# that supports building, running, and debugging supertux
+
+# GTK3 is installed to fix a segfault when starting supertux.
+# It or one of its dependencies fixes the crash.
+
+FROM --platform=amd64 registry.fedoraproject.org/fedora-toolbox:38
+RUN sudo dnf -y install cmake gcc-c++ gdb SDL2{,-devel} libGLEW glew{,-devel} libogg{,-devel} freetype{,-devel} glm-devel zlib{,-devel} SDL2_image{,-devel} libvorbis{,-devel} libcurl{,-devel}.x86_64 openal{,-devel} gtk3