watchdog-go: ci 手動実行を許可

.gitea/workflows/watchdog-build.yaml

@@ -4,6 +4,7 @@
         - opened
         - synchronize
         - labeled
+    workflow_dispatch:
 
   jobs:
     build-docker-image:
@@ -15,7 +16,8 @@
         ((github.event.action == 'labeled') && 
                 (github.event.label.name == 'watchdog-go')) ||
               ((github.event.action == 'synchronize') &&
-                contains(github.event.pull_request.labels.*.name, 'watchdog-go')
+                contains(github.event.pull_request.labels.*.name, 'watchdog-go') ||
+        (github.event.action == 'workflow_dispatch')
 
       steps:
         - uses: actions/checkout@v3