change build-action to build when tag is set

.gitea/workflows/create_and_push_multiarch_container.yml

@@ -2,12 +2,9 @@ name: build-image
 run-name: build and push Docker-Image
 
 on:
-  workflow_dispatch: # Manuelles Auslösen des Workflows
-    inputs:
-      image_tag:
-        description: '2. Tag für das Docker-Image (z.B. 1.0.0)'
-        required: true
-        default: '0.3.0'
+  push:
+    tags:
+      - "*"
 
 env:
   image_name: doc_rudi
@@ -42,5 +39,5 @@ jobs:
             --file ./Dockerfile \
             --platform linux/amd64,linux/386,linux/arm64,linux/arm/v7 \
             --tag ${{ env.registry }}/${{ env.user }}/${{ env.image_name }}:latest \
-            --tag ${{ env.registry }}/${{ env.user }}/${{ env.image_name }}:${{ github.event.inputs.image_tag }} \
+            --tag ${{ env.registry }}/${{ env.user }}/${{ env.image_name }}:${{ github.ref_name }} \
             --push ./