CI/Linux: Build/publish Docker images used to create AppImages #270

Job	Run time
Code Linting / Format / Lint	7s
macOS / dmg (release, Qt 5.15.2, macos-12)	2m 54s
macOS / Build (debug, homebrew (qt5), macos-12)	3m 10s
macOS / dmg (release, Qt 6.5.2, macos-12)	6m 38s
Windows / Build (x64, release, Qt 5.15.2, windows-2019)	2m 10s
macOS / Build (debug, homebrew (qt6), macos-12)	2m 12s
Linux / AppImage (release, Qt 5, appimage-qt5)	2m 53s
Windows / Build (x86, release, Qt 5.15.2, windows-2019)	2m 9s
Linux / AppImage (release, Qt 6, appimage-qt6)	3m 0s
Windows / Build (x64, release, Qt 6.4.3, windows-2019)	3m 2s
Linux / deb (release, Qt 5, ubuntu-20_04)	1m 31s
Linux / rpm (release, Qt 6, fedora)	1m 56s
Linux / deb (release, Qt 6, ubuntu-22_04)	2m 2s
Linux / snap	5m 39s
Linux / rpm (release, Qt 6, opensuse)	2m 35s
Linux / deb (release, Qt 6, ubuntu-23_10)	2m 20s
Windows / Unified x64-x86 Installer	55s
	45m 13s

Provide feedback