diff --git a/.gitea/workflows/build-docs.yml b/.gitea/workflows/build-docs.yml
index 21c8dca..e70844c 100644
--- a/.gitea/workflows/build-docs.yml
+++ b/.gitea/workflows/build-docs.yml
@@ -10,6 +10,12 @@ jobs:
     steps:
       - name: Set up Git repository
         uses: actions/checkout@v6
+      - name: Sign into gitea registry
+        uses: actions/docker-login@main
+        with:
+          username: ${{ vars.REGISTRY_USER_USERNAME }}
+          password: ${{ secrets.REGISTRY_USER_PASSWORD }}
+          registry: ${{ vars.REGISTRY_BASE_URL }}
       - name: Run build
         uses: actions/latex@main
         with: