refactor: remove flatpak builder infrastructure and update builder image with mold linker and dependency versions

fix: update base image to Ubuntu 24.04 for appstream-compose support

fix: reorder appstream installation in Flatpak builder Dockerfile

fix: ensure appstream is installed in Flatpak builder Dockerfile

fix: update Flathub repository addition to use --user flag

fix: remove appstream-compose installation and reorder Dockerfile sections

fix: update appstream installation to appstream-compose in Flatpak builder Dockerfile

fix: add appstream installation in Flatpak builder Dockerfile

feat: added runtime and SDK installation

fix: update Node.js installation to version 24 in Flatpak builder Dockerfile

fix: update Node.js installation to version 20 and clean up Dockerfile

fix: update Node.js version to 24 in Dockerfiles and add sccache installation

fix: correct dbus-daemon-proxy to xdg-dbus-proxy in Dockerfile

add Flatpak builder Dockerfile and workflow for building and pushing images

add .actrc file