Prevent build.yml workflow to trigger on tags push

(This is already handled by release.yml for release tags)

NB: We use here `branches = "*"` condition instead of `tags-ignore = "*"`
because the latter prevent also build.yml to trigger on commit push on
regular branches (oddly enough)

.github/workflows/build.yml

@@ -2,6 +2,8 @@ name: 🔨 Build scikit-decide
 
 on:
   push:
+    branches:
+      - "*"
   pull_request:
   workflow_dispatch: