diff --git a/.gitea/workflows/build-push.yaml b/.gitea/workflows/build-push.yaml
index f66d89e..5464ffc 100644
--- a/.gitea/workflows/build-push.yaml
+++ b/.gitea/workflows/build-push.yaml
@@ -58,6 +58,7 @@ jobs:
 
       - name: Compute image tag
         id: tag
+        shell: bash
         run: |
           SHORT_SHA="${{ gitea.sha }}"
           SHORT_SHA="${SHORT_SHA:0:7}"