fix(ci): add manual step

.woodpecker/.build.yaml

@@ -16,7 +16,7 @@ steps:
       - ${CI_PIPELINE_NUMBER}
   when:
     - branch: main
-      event: push
+      event: [push, manual]
 - name: docker-staging
   image: woodpeckerci/plugin-docker-buildx
   settings:
@@ -36,6 +36,6 @@ steps:
   when:
     - branch:
         exclude: main
-      event: push
+      event: [push, manual]
 depends_on:
   - lint