add docker to example stage

Author: donbing

.github/workflows/build-pi-image.yml

@@ -26,12 +26,11 @@ jobs:
           {
           cat > test-stage/package-test/00-run-chroot.sh <<-EOF
           #!/bin/bash
-          apt-get install -y curl
-          curl -fsSL https://deb.nodesource.com/setup_22.x | bash -
+          apt-get install -y docker.io
           EOF
           } &&
           chmod +x test-stage/package-test/00-run-chroot.sh &&
-          echo "nodejs" > test-stage/package-test/01-packages &&
+          echo "docker.io" > test-stage/package-test/01-packages &&
           {
           cat > test-stage/prerun.sh <<-EOF
           #!/bin/bash -e