nixpkgs: add aarch64-linux to release-lib

cc #23638

pkgs/top-level/release-lib.nix

@@ -25,6 +25,7 @@ rec {
   pkgsFor = system:
     if system == "x86_64-linux" then pkgs_x86_64_linux
     else if system == "i686-linux" then pkgs_i686_linux
+    else if system == "aarch64-linux" then pkgs_aarch64_linux
     else if system == "x86_64-darwin" then pkgs_x86_64_darwin
     else if system == "x86_64-freebsd" then pkgs_x86_64_freebsd
     else if system == "i686-freebsd" then pkgs_i686_freebsd
@@ -34,6 +35,7 @@ rec {
 
   pkgs_x86_64_linux = allPackages { system = "x86_64-linux"; };
   pkgs_i686_linux = allPackages { system = "i686-linux"; };
+  pkgs_aarch64_linux = allPackages { system = "aarch64-linux"; };
   pkgs_x86_64_darwin = allPackages { system = "x86_64-darwin"; };
   pkgs_x86_64_freebsd = allPackages { system = "x86_64-freebsd"; };
   pkgs_i686_freebsd = allPackages { system = "i686-freebsd"; };