diff --git a/.gitea/workflows/build.yml b/.gitea/workflows/build.yml
index e6911f4..e441075 100644
--- a/.gitea/workflows/build.yml
+++ b/.gitea/workflows/build.yml
@@ -3,7 +3,7 @@ name: Build probe jar
 on:
   push:
     branches:
-      - main
+      - master
   workflow_dispatch: {}
 
 jobs:
@@ -15,7 +15,13 @@ jobs:
         - /home/clustermaster/storage/cdn/serve/internal/probe:/output
     steps:
       - name: Check out repository
-        uses: actions/checkout@v4
+        run: |
+          command -v git >/dev/null || (apt-get update && apt-get install -y --no-install-recommends git)
+          auth=$(printf '%s' "x-access-token:${GITHUB_TOKEN}" | base64 -w0)
+          git init -q .
+          git -c http.extraHeader="Authorization: Basic ${auth}" \
+            fetch --depth=1 "${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}.git" "${GITHUB_SHA}"
+          git checkout -q FETCH_HEAD
 
       - name: Build shadow jar
         run: |