diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index 75505e0..04cdf30 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -21,9 +21,27 @@ jobs:
       DJANGO_ALLOWED_HOSTS: "127.0.0.1,localhost"
       IMAGE_NAME: achievement_inputing_ci
     steps:
+      - name: Ensure source present
+        env:
+          SERVER: ${{ github.server_url }}
+          REPO: ${{ github.repository }}
+          REF: ${{ github.ref }}
+          SHA: ${{ github.sha }}
+          TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          if [ -f "$GITHUB_WORKSPACE/Dockerfile" ]; then exit 0; fi
+          mkdir -p "$GITHUB_WORKSPACE"
+          cd "$GITHUB_WORKSPACE"
+          git init .
+          if [ -z "$TOKEN" ]; then
+            git fetch --depth=1 "$SERVER/$REPO.git" "$REF"
+          else
+            git -c http.extraHeader="Authorization: Bearer $TOKEN" fetch --depth=1 "$SERVER/$REPO.git" "$REF"
+          fi
+          git checkout FETCH_HEAD
       - name: Build application image
         run: |
-          docker build -t "$IMAGE_NAME" -f Dockerfile .
+          docker build -t "$IMAGE_NAME" -f "$GITHUB_WORKSPACE/Dockerfile" "$GITHUB_WORKSPACE"
       - name: Output image info
         run: |
           docker image inspect "$IMAGE_NAME" --format '{{.Id}} {{.Size}}'