diff --git a/.gitea/workflows/backend-docker.yml b/.gitea/workflows/backend-docker.yml
index 9cb7751..b4389bd 100644
--- a/.gitea/workflows/backend-docker.yml
+++ b/.gitea/workflows/backend-docker.yml
@@ -22,6 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
+      max-parallel: 1
       matrix:
         include:
           - component: backend
@@ -162,6 +163,10 @@ jobs:
             exit 1
           fi
 
+      - name: Cleanup docker cache
+        shell: bash
+        run: docker system prune -af --volumes || true
+
       - name: Build image
         shell: bash
         env: