Adapt to generic Makefiles #187

Job	Run time
Default release build / Build documentation for all repos	4m 3s
Default release build / Build release for linux on ubuntu-20.04	12m 37s
Default release build / Build release for osx on macos-latest	11m 12s
Default release build / Build release for windows on windows-2019	13m 27s
Default release build / Build release for freebsd on macos-12	18m 9s
Validate outputs of build_release_template.yml	1s
Validate results of build_release_template.yml (windows-latest, windows, dmd.makefiles.windows.7z)	44s
Validate results of build_release_template.yml (macos-latest, osx, dmd.makefiles.osx.tar.xz)	23s
Validate results of build_release_template.yml (ubuntu-latest, linux, dmd.makefiles.linux.tar.xz)	17s
Validate results of build_release_template.yml (macos-12, freebsd, dmd.makefiles.freebsd-64.tar.xz)	3m 36s
	1h 4m 29s

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