We were doing a few things suboptimally:
1. Making a symlink from the current directory to
../../gstreamer/cerbero so that build-tools kept working, which
should not be necessary since cerbero relocates all binaries inside
the cerbero homedir after extracting the cache.
2. Hard-coding the cerbero builddir when building on Windows because
`pwd` was outputting an MSYS-style path which Python can't read
3. rsync-ing all the contents of $CERBERO_HOST_DIR, which is
bad because we should be building on top of the artifact cache.
The only thing we want from $CERBERO_HOST_DIR is cerbero-sources
(the network cache), and we can setup the toolchain during
bootstrap with the new --system and --toolchains arguments which
were split out of --system-only.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-ci/-/merge_requests/350>
This commit adds the last bits needed to have a working
CI job of cerbero using mingw and msvc17 toolchain.
It adds a new stage to the docker image that mirrors
the setup of the cerbero fedora docker build, and
tweaks the cerbero_setup script run by jobs with
a couple windows specific fixes.
Close#39
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-ci/-/merge_requests/334>
