spawn more docker containers and control their networking

.github/workflows/docker_demo.yml

@@ -1,11 +1,18 @@
 name: Docker demo
 on: [push]
 jobs:
-  Explore-GitHub-Actions:
+  RunDockerInDocker:
     runs-on: ubuntu-latest
     container: node:18
     steps:
       - uses: actions/checkout@v4
-      - run: |
-          docker run hello-world
+      - uses: addnab/docker-run-action@v3
+        with:
+          image: ubuntu:latest
+          options: --mac-address 08:00:27:68:c9:35
+          run: |
+            echo "blah"
+            apt update
+            apt install -y iproute2
+            ip addr
       - run: echo "🍏 This job's status is ${{ job.status }}."