Build Flood v4.7.0 in client-only mode with manual release selection

.gitea/workflows/build-push.yml

@@ -1,14 +1,12 @@
 name: Build and Push Custom Flood Image
 
 on:
-  push:
-    branches: [main]
   workflow_dispatch:
     inputs:
       flood_version:
         description: 'jesec/flood release tag'
         required: true
-        default: 'v4.16.2'
+        default: 'v4.7.0'
         type: string
 
 jobs:
@@ -26,8 +24,9 @@ jobs:
 
       - name: Fetch Flood release
         env:
-          FLOOD_VERSION: ${{ github.event.inputs.flood_version || 'v4.16.2' }}
+          FLOOD_VERSION: ${{ github.event.inputs.flood_version }}
         run: |
+          test -n "$FLOOD_VERSION" || { echo "flood_version is required" >&2; exit 1; }
           git check-ref-format "refs/tags/$FLOOD_VERSION"
           git init flood-repo
           git -C flood-repo fetch --depth=1 https://github.com/jesec/flood.git "refs/tags/$FLOOD_VERSION"