trigger build workflow on tag pushes (#5)

Author: kristianhentschelbbc

.github/workflows/build.yml

@@ -4,6 +4,8 @@ on:
   push:
     branches:
       - main
+    tags:
+      - 'v[0-9]+.[0-9]+.[0-9]+'
 jobs:
   build_and_release:
     runs-on: macos-14