Fix windows publish workflow not skipping Gtk install

Author: Kangaroux

.github/workflows/publish.yml

@@ -92,7 +92,7 @@ jobs:
           name: build
 
       - name: Publish
-        run: GtkSkipInstall=True ./tasks.sh publish
+        run: ./tasks.sh publish
         shell: bash
 
       - name: Bundle

tasks.sh

@@ -121,6 +121,8 @@ function fnPublish() {
 
     echo "-> Publishing OpenChart to $out_dir/"
 
+    export SkipGtkInstall=True
+
     rm -rf $out_dir
     dotnet publish -o $out_dir -r $PLATFORM -c Release OpenChart
     fnCopyAssets $out_dir