watchdog-go: ciをマージ後に行えるように

.gitea/workflows/watchdog-build.yaml

@@ -1,21 +1,13 @@
 on:
   pull_request:
     types:
-      - opened
-      - synchronize
-      - labeled
+      - closed
   workflow_dispatch:
 
 permissions:
   pull-requests: read
 
 jobs:
-  test:
-    runs-on: ubuntu-latest
-    steps:
-      - run: echo ${{github.event.action}}
-      - run: echo ${{ contains(github.event.pull_request.labels.*.name, 'watchdog-go') }}
-
   build-docker-image:
     runs-on: ubuntu-latest
     container:
@@ -23,12 +15,8 @@ jobs:
     defaults:
       run:
         working-directory: ./watchdog-go
-    if: |
-      ((github.event.action == 'labeled') && 
-              (github.event.label.name == 'watchdog-go')) ||
-            ((github.event.action == 'synchronized') &&
-              contains(github.event.pull_request.labels.*.name, 'watchdog-go')) ||
-      (github.event.action == 'workflow_dispatch')
+    if: github.event.pull_request.merged == true && contains(github.event.pull_request.labels.*.name,'watchdog-go')
+
 
     steps:
       - uses: actions/checkout@v3