Flatpak-builder CI

Don't ignore `--build-shell` option when configuration fails #479

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Run time

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Job	Run time
Build with gcc and test	3m 8s
Build with clang	1m 21s
Ubuntu 22.04 meson build (gcc)	2m 20s
Ubuntu 22.04 meson build (clang)	2m 58s
	9m 47s