diff --git a/.forgejo/workflows/build-container.yaml b/.forgejo/workflows/build-container.yaml
index 6bd08e0..6e5ed38 100644
--- a/.forgejo/workflows/build-container.yaml
+++ b/.forgejo/workflows/build-container.yaml
@@ -30,6 +30,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
+          ref: ${{ inputs.ref || github.sha }}
           fetch-depth: 2
 
       - name: Detect and classify changed containers