actually specify the image for appimage #128

Job	Run time
Build ubuntu LTS docker image	1m 36s
Build ubuntu for AppImage docker image	5m 5s
Build old debian docker image	0s
Build debian docker image	1m 27s
Build flatpak docker	2m 34s
Build windows docker image	5m 2s
Build 32 bit windows docker image	6m 14s
Check for translatable strings	33s
Update nightly release tag	8s
Debian Old	0s
Ubuntu LTS (full, Debug)	8m 38s
Ubuntu LTS (full, Release)	7m 2s
Ubuntu LTS (minimal, Debug)	6m 13s
Ubuntu LTS (minimal, Release)	5m 34s
Debian (full, Debug)	6m 47s
Debian (full, Release)	8m 33s
Debian (minimal, Debug)	6m 16s
Debian (minimal, Release)	7m 27s
macOS distributable	1h 15m 42s
Appimage	11m 7s
Flatpak	21m 6s
Windows (Debug)	1h 43m 26s
Windows (Release)	1h 9m 19s
Windows i686 (Debug)	1h 16m 8s
Windows i686 (Release)	1h 10m 45s
	8h 26m 42s

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