chore(ci): Build/publish Docker images used to create AppImages #271

Job	Run time
Code Linting / Format / Lint	9s
Linux / AppImage (release, Qt 5, appimage-qt5)	3m 39s
Linux / AppImage (release, Qt 6, appimage-qt6)	3m 41s
Linux / snap	5m 17s
Linux / rpm (release, Qt 6, fedora)	1m 55s
Linux / deb (release, Qt 5, ubuntu-20_04)	1m 20s
Linux / rpm (release, Qt 6, opensuse)	2m 45s
Linux / deb (release, Qt 6, ubuntu-22_04)	1m 57s
Linux / deb (release, Qt 6, ubuntu-23_10)	2m 3s
macOS / dmg (release, Qt 5.15.2, macos-12)	5m 10s
macOS / Build (debug, homebrew (qt5), macos-12)	1m 50s
macOS / dmg (release, Qt 6.5.2, macos-12)	7m 44s
Windows / Build (x64, release, Qt 5.15.2, windows-2019)	2m 31s
macOS / Build (debug, homebrew (qt6), macos-12)	4h 27m 40s
Windows / Build (x86, release, Qt 5.15.2, windows-2019)	2m 29s
Windows / Build (x64, release, Qt 6.4.3, windows-2019)	3m 26s
Windows / Unified x64-x86 Installer	53s
	5h 14m 29s

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