fixup! maint: remove obsolete CI/maint and re-implement source index #57

Job	Run time
call-build-ubuntu / build-ubuntu	3m 53s
call-build-alpine / build-alpine	2m 13s
call-build-fedora / build-fedora	2m 3s
call-build-macos / build-macos	1m 29s
call-build-solaris / build-solaris	5m 27s
	15m 5s

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