fix(ci): remove local image build step for Trivy scanning

.gitea/workflows/docker-publish.yml

@@ -70,17 +70,6 @@ jobs:
           username: ${{ gitea.actor }}
           password: ${{ secrets.REGISTRY_TOKEN }}
 
-      # Build a single-arch image locally so Trivy can inspect it before the real push.
-      - name: Build local image for scanning
-        uses: docker/build-push-action@v5
-        with:
-          context: .
-          target: final
-          platforms: linux/amd64
-          load: true
-          tags: scan-target:${{ inputs.tag }}
-          cache-from: type=registry,ref=${{ env.REGISTRY }}/${{ gitea.repository }}:buildcache
-
       - name: Build and push
         uses: docker/build-push-action@v5
         with: