add back docker install step

.forgejo/workflows/docker-image.yml

@@ -10,6 +10,8 @@ jobs:
     steps:
       - name: Check out the repo
         uses: actions/checkout@v2
+      - name: Install docker
+        uses: https://git.wbrawner.com/papodaca/install-docker-action@main 
       - name: Docker meta
         id: meta
         uses: docker/metadata-action@v4