steam.buildRuntimeEnv: plumb privateTmp

pkgs/by-name/he/heroic/package.nix

@@ -5,7 +5,7 @@
   extraLibraries ? pkgs: [ ],
 }:
 
-(steam.override { privateTmp = false; }).buildRuntimeEnv {
+steam.buildRuntimeEnv {
   pname = "heroic";
   inherit (heroic-unwrapped) version meta;
 
@@ -19,4 +19,6 @@
     ln -s ${heroic-unwrapped}/share/applications $out/share
     ln -s ${heroic-unwrapped}/share/icons $out/share
   '';
+
+  privateTmp = false;
 }

pkgs/by-name/st/steam/package.nix

@@ -21,6 +21,7 @@ let
       extraPreBwrapCmds ? "",
       extraBwrapArgs ? [ ],
       extraEnv ? { },
+      privateTmp ? true,
       ...
     }@args:
     buildFHSEnv (
@@ -150,6 +151,7 @@ buildRuntimeEnv {
     extraPreBwrapCmds
     extraBwrapArgs
     extraEnv
+    privateTmp
     ;
 
   runScript = writeShellScript "steam-wrapped" ''
@@ -175,6 +177,7 @@ buildRuntimeEnv {
             extraPreBwrapCmds
             extraBwrapArgs
             extraEnv
+            privateTmp
             ;
 
           runScript = writeShellScript "steam-run" ''