diff --git a/.gitea/workflows/build-image.yaml b/.gitea/workflows/build-image.yaml
deleted file mode 100644
index 18ab105..0000000
--- a/.gitea/workflows/build-image.yaml
+++ /dev/null
@@ -1,25 +0,0 @@
----
-name: build-image
-on:
-    push:
-        branches:
-            - master
-
-jobs:
-    create-empty-commit:
-        container:
-            image: focs.ji.sjtu.edu.cn:5000/gitea/runner-images:ubuntu-latest
-            volumes:
-                - /home/actions/.ssh:/root/.ssh
-        steps:
-            - name: Set up Git
-              run: |
-                  git config --global user.name "gitea-actions[bot]"
-                  git config --global user.email "gitea-actions[bot]@users.noreply.gitea.com"
-                  chown -R root:root /root/.ssh
-            - name: Clone, Commit and Push
-              run: |
-                  git clone ssh://git@focs.ji.sjtu.edu.cn:2222/JOJ/runner-images.git runner-images
-                  cd runner-images
-                  git commit --allow-empty -m "chore: trigger gitea actions by JOJ3"
-                  git push
diff --git a/.gitea/workflows/test.yaml b/.gitea/workflows/build.yaml
similarity index 66%
rename from .gitea/workflows/test.yaml
rename to .gitea/workflows/build.yaml
index a7a5081..6eac295 100644
--- a/.gitea/workflows/test.yaml
+++ b/.gitea/workflows/build.yaml
@@ -1,5 +1,5 @@
 ---
-name: checks
+name: build
 on:
     - push
     - pull_request
@@ -42,3 +42,22 @@ jobs:
               run: |
                   make prepare-test
                   make ci-test
+    trigger-build-image:
+        container:
+            image: focs.ji.sjtu.edu.cn:5000/gitea/runner-images:ubuntu-latest
+            volumes:
+                - /home/actions/.ssh:/root/.ssh
+        needs: build
+        if: github.ref == 'refs/heads/master'
+        steps:
+            - name: Set up Git
+              run: |
+                  git config --global user.name "gitea-actions[bot]"
+                  git config --global user.email "gitea-actions[bot]@users.noreply.gitea.com"
+                  chown -R root:root /root/.ssh
+            - name: Clone, Commit and Push
+              run: |
+                  git clone ssh://git@focs.ji.sjtu.edu.cn:2222/JOJ/runner-images.git runner-images
+                  cd runner-images
+                  git commit --allow-empty -m "chore: trigger gitea actions by JOJ3"
+                  git push