nixos/gitlab: Deduplicate runtime dependency listing

nixos/modules/services/misc/gitlab.nix

@@ -190,6 +190,16 @@ let
     MALLOC_ARENA_MAX = "2";
   } // cfg.extraEnv;
 
+  runtimeDeps = with pkgs; [
+    nodejs
+    gzip
+    git
+    gnutar
+    postgresqlPackage
+    coreutils
+    procps
+  ];
+
   gitlab-rake = pkgs.stdenv.mkDerivation {
     name = "gitlab-rake";
     buildInputs = [ pkgs.makeWrapper ];
@@ -199,7 +209,7 @@ let
       mkdir -p $out/bin
       makeWrapper ${cfg.packages.gitlab.rubyEnv}/bin/rake $out/bin/gitlab-rake \
           ${concatStrings (mapAttrsToList (name: value: "--set ${name} '${value}' ") gitlabEnv)} \
-          --set PATH '${lib.makeBinPath [ pkgs.nodejs pkgs.gzip pkgs.git pkgs.gnutar postgresqlPackage pkgs.coreutils pkgs.procps ]}:$PATH' \
+          --set PATH '${lib.makeBinPath runtimeDeps}:$PATH' \
           --set RAKEOPT '-f ${cfg.packages.gitlab}/share/gitlab/Rakefile' \
           --chdir '${cfg.packages.gitlab}/share/gitlab'
      '';
@@ -214,7 +224,7 @@ let
       mkdir -p $out/bin
       makeWrapper ${cfg.packages.gitlab.rubyEnv}/bin/rails $out/bin/gitlab-rails \
           ${concatStrings (mapAttrsToList (name: value: "--set ${name} '${value}' ") gitlabEnv)} \
-          --set PATH '${lib.makeBinPath [ pkgs.nodejs pkgs.gzip pkgs.git pkgs.gnutar postgresqlPackage pkgs.coreutils pkgs.procps ]}:$PATH' \
+          --set PATH '${lib.makeBinPath runtimeDeps}:$PATH' \
           --chdir '${cfg.packages.gitlab}/share/gitlab'
      '';
   };