Move to alpine

.forgejo/workflows/mirror-repository.yml

@@ -9,7 +9,7 @@ jobs:
     name: Pull from upstream
     runs-on: x86_64
     container:
-      image: 'docker.io/node:20-bookworm'
+      image: alpine:latest
     env:
       upstream: https://git.joeyh.name/git/git-annex.git 
       destination: ${{ github.server_url }}/${{ github.repository }}
@@ -17,6 +17,8 @@ jobs:
       token: ${{ secrets.CODE_FORGEJO_TOKEN }}
       owner: ${{ vars.OWNER }}
     steps:
+      - name: Environment setup
+        run: apk add grep git sed coreutils bash
       - name: Comparing tags of upstream and destination
         run: |
           git ls-remote $upstream "refs/tags/$tags" | grep -v '{' | sed 's|.*/||' > upstream_tags