coolercontrol.coolercontrold: Hardcode a shell

So we don't need to add bash to the service's PATH

pkgs/applications/system/coolercontrol/coolercontrold.nix

@@ -2,6 +2,7 @@
 , buildNpmPackage
 , testers
 , coolercontrol
+, runtimeShell
 }:
 
 { version
@@ -16,11 +17,15 @@ rustPlatform.buildRustPackage {
 
   cargoHash = "sha256-qXZ/LXbKkLvnEQibGyMvkkYhz2eEGUHsYxVF3EbCpFc=";
 
-  # copy the frontend static resources to a directory for embedding
   postPatch = ''
+    # copy the frontend static resources to a directory for embedding
     mkdir -p ui-build
     cp -R ${coolercontrol.coolercontrol-ui-data}/* ui-build/
     substituteInPlace build.rs --replace '"./resources/app"' '"./ui-build"'
+
+    # Hardcode a shell
+    substituteInPlace src/repositories/utils.rs \
+      --replace-fail 'Command::new("sh")' 'Command::new("${runtimeShell}")'
   '';
 
   postInstall = ''