om ci: Include systems (and flake) in result JSON

[srid]

This breaks backwards compatibility.

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Necessary towards: juspay/cachix-push#8

$ jq -r --arg prefix "$(git branch --show-current)" 'if (.systems | length) != 1 then error("systems array must have exactly 1 element") else .systems[0] as $sys | .result.ROOT.build.byName | with_entries(.key = "\($prefix)-" + .key + "-\($sys)") | to_entries[] | [.key, .value] | .[] end' < json | xargs -n2 echo cachix pin mycache
cachix pin mycache main-ghc-shell-for-packages-0-x86_64-linux /nix/store/jx8rx1x2acn3r6jdwnp9cg4kjam9apyi-ghc-shell-for-packages-0
cachix pin mycache main-bar-x86_64-linux /nix/store/ckb05d6n10sammn4x2x9gqfwxnx5vhbg-bar-0.1.0.0
cachix pin mycache main-foo-x86_64-linux /nix/store/98sm6nw32jlhc9br83703zfxqk3d6ccx-foo-0.1.0.0