nix-store –add returns a trailing LF which caused wrong include paths for the github PR plugin JSON input.
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my $storePath = `nix-store --add "$tempdir/github-pulls-sorted.json"`
or die "cannot copy path $filename to the Nix store.\n";
my $storePath = trim(`nix-store --add "$tempdir/github-pulls-sorted.json"`
or die "cannot copy path $filename to the Nix store.\n");