github: add FUNDING.yml #3173

Job	Run time
nix-build-develop-clang (none, release, true)	3m 4s
nix-build-develop-clang (none, release, false)	3m 6s
nix-build-develop-clang (none, debug, true)	2m 44s
nix-build-develop-gcc (none, release, true)	3m 5s
nix-build-develop-clang (none, debug, false)	2m 46s
nix-build-develop-gcc (none, release, false)	3m 9s
nix-build-develop-gcc (none, debug, true)	3m 0s
nix-build-develop-gcc (none, debug, false)	3m 4s
nix-build-develop-gcc (address, release, true)	4m 46s
nix-build-develop-gcc (address, release, false)	4m 44s
nix-build-develop-gcc (address, debug, true)	4m 2s
nix-build-develop-gcc (address, debug, false)	4m 5s
nix-build-develop-gcc (undefined, release, true)	4m 14s
nix-build-develop-gcc (undefined, release, false)	4m 12s
nix-build-develop-gcc (undefined, debug, true)	3m 24s
nix-build-develop-gcc (undefined, debug, false)	3m 28s
	56m 53s

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