ci: build release only on version tag

Author: neopostmodern

.github/workflows/build-electron-production.yml

@@ -1,7 +1,8 @@
 on:
   push:
-    branches:
-      - master
+    tags:
+      - 'v[0-9]+.[0-9]+.[0-9]+'
+
 jobs:
   build:
     name: Build Electron app (production)