Use alpine-bash as base container

.forgejo/workflows/build.yaml

@@ -4,7 +4,7 @@ on:
     - cron: '0 0 * */1 *'
 jobs:
   build:
-    runs-on: docker
+    runs-on: alpine-bash
     steps:
       - run: apk add buildah wget
       - run: buildah login --username ${{ secrets.username }} --password ${{ secrets.password }} ${GITHUB_SERVER_URL}

Dockerfile

@@ -1,3 +1,3 @@
 # hadolint ignore=DL3006
-FROM alpine:latest
+FROM git.geekify.de/containers/alpine-bash:latest
 RUN apk add buildah wget