Pass docker socket to job containers, use docker:24 for image builds

.gitea/workflows/build-runner.yml

@@ -10,6 +10,10 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    container:
+      image: docker:24
+      volumes:
+        - /var/run/docker.sock:/var/run/docker.sock
     steps:
       - name: Checkout
         uses: actions/checkout@v4