diff --git a/.forgejo/workflows/example.yaml b/.forgejo/workflows/example.yaml
index bfc0bc2..6eae187 100644
--- a/.forgejo/workflows/example.yaml
+++ b/.forgejo/workflows/example.yaml
@@ -6,6 +6,6 @@ jobs:
   test:
     runs-on: docker
     container:
-      image: alpine:3.19
+      image: git.hswro.org/fleg/actions-experiments:latest
     steps:
       - run: cat /etc/os-release
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..4a74ebf
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,3 @@
+FROM alpine:3.20
+
+RUN apk add --update gcc g++ make openssl-dev libc-dev ruby ruby-dev ruby-bundler ruby-json