build-aux: Replace Flatpak modules with pre-compiled dependencies #10934
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To reduce compile time and prepare for aarch64 support, dependencies compilation except CEF is moved to a BuildStream project junctionned with Freedesktop SDK. The BuildStream project is configured to build dependencies in a Flatpak-like environment.
The Qt components are from the same repo as other dependencies. The KDE Platform was never a good fit for OBS Studio for multiple reasons: - Life cycle too short and misaligned with OBS Studio causing users to get EOL notification too often. - Third-party Qt plugins were allowed which could change Qt's behavior. - KDE exclusives sandboxed holes were inherited.
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Description
Important
This PR relies on https://github.com/tytan652/obs-deps-bst, the PR is also meant to discuss including the BuildStream-based project under the obsproject org.
This PR is x86_64 only, if it gets approved, #9979 will be refactored with aarch64 tarballs and I will try to work on documenting obs-deps-bst.
To reduce compile time and prepare for aarch64 support, dependencies compilation except CEF is moved to a BuildStream project junctionned with Freedesktop SDK.
The BuildStream project is configured to build dependencies in a Flatpak-like environment.
Motivation and Context
Move away dependency compile time, in an aarch64 context it moves away 6 hours of build time to another repo with ~3 hours of build time* without cache.
So only the CEF wrapper and OBS have to be built on this repo CI, so ~1h IIRC for aarch64 without cache.
*Build time is reduced since BuildStream tries to build elements in parallel when possible even with QEMU emulation.
Also on obs-deps-bst side, sources are cached so outage of independent git remote is not an issue if cached.
How Has This Been Tested?
Types of changes
Checklist: