GHA: Build in an Ubuntu 18.04 container #113

Job	Run time
Select platforms	2s
linux-x64-hs-minimal	0s
linux-x64-hs-nopch	0s
linux-x64-hs-zero	0s
linux-x86	0s
macos-aarch64	0s
macos-x64	0s
linux-x64-hs-optimized	0s
windows-aarch64	0s
docs	0s
linux-x64 / build	1m 12s
windows-x64 / build (release)	10m 58s
linux-x86	0s
windows-x64 / build (debug, --with-debug-level=fastdebug, -debug)	10m 55s
macos-x64	0s
linux-x64	0s
linux-cross-compile	0s
windows-x64	1s
Remove bundle artifacts	4s
	23m 12s

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