add tag to pipeline

.github/workflows/build_minetest_tar.yml

@@ -6,9 +6,9 @@ name: CI
 on:
   # Triggers the workflow on push or pull request events but only for the "main" branch
   push:
-    branches: [ "main" ]
+    branches: ["main"]
   pull_request:
-    branches: [ "main" ]
+    branches: ["main"]
 
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
@@ -48,4 +48,4 @@ jobs:
         uses: softprops/action-gh-release@v2
         with:
           files: /home/runner/work/minetest_builder/minetest_builder/minetest-master/minetest-5.9.0-dev-linux.tar.gz
-
+          tag_name: v5.9.0