diff --git a/.gitea/workflows/test.yml b/.gitea/workflows/test.yml
index b662cf6..9993725 100644
--- a/.gitea/workflows/test.yml
+++ b/.gitea/workflows/test.yml
@@ -1,4 +1,4 @@
-on: [push, pull_request, workflow_dispatch]
+on: [push, workflow_dispatch]
 
 jobs:
   build-images:
@@ -12,7 +12,7 @@ jobs:
 
       - name: Build GCC container
         working-directory: test5
-        run: docker build . -f Dockerfile -t local/alpine-gcc-${{gitea.ref_name}}:latest
+        run: docker build . -f Dockerfile -t local/alpine-gcc-${{gitea.sha}}:latest
 
   run-tests:
     runs-on: host-arch-x86_64
@@ -22,4 +22,10 @@ jobs:
         run: git clone --revision ${{ gitea.sha }} --depth 1 ${{ gitea.server_url }}/${{ gitea.repository }}
 
       - name: Run tests
-        run: docker run -it --rm -v ./test5:/app local/alpine-gcc-${{gitea.ref_name}}:latest
+        run: docker run -it --rm -v ./test5:/app local/alpine-gcc-${{gitea.sha}}:latest
+
+  cleanup:
+    runs-on: host-arch-x86_64
+    steps:
+      - name: Remove built container images
+        run: docker image rm local/alpine-gcc-${{gitea.sha}}:latest