* Move the exported PATH variables into a script so we can source it in all the wrapper scripts. * Add a guard to only copy over the cache when the SUBPROJECTS_CACHE_DIR variable is set, which only happens on CI by default * Make it possible to run the scripts with default values for some of the variables, like WERROR and MESON_ARGS. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7591>