First iteration on f/ci-desktop: the core job builds libsimplex.so with scripts/desktop/build-lib-linux.sh on ubuntu-24.04 (GHC 9.6.3, direct-sqlcipher +openssl, no VLC) and caches it by source hash, with the cabal store cached separately. The app job builds :desktop:createDistributable with Corretto 17 and the repo's assets, runs :common:desktopTest, then starts the app under Xvfb and openbox with software rendering and drives onboarding to the chat list and typing in the search field with the ui helper (xdotool input, tesseract OCR to find text), saving numbered screenshots, the text read from them and a step log as artifacts.
