ci: Pass --container-runtime=containerd on smoke-test jobs

The smoke jobs did not pass a runtime flag, so they used the product
default. Smoke has one start per driver and platform, so that run
should exercise containerd, not docker.

Pass --container-runtime=containerd and rename the jobs from
*-docker-* to *-containerd-*. Keep the flag explicit so the job
name and start args stay in sync.

Author: nirs

.github/workflows/smoke-test.yml

@@ -41,25 +41,25 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - name: qemu-docker-macos-15-x86
+          - name: qemu-containerd-macos-15-x86
             driver: qemu
             os: macos-15-intel
-            start_flags: --network socket_vmnet --force
+            start_flags: --network socket_vmnet --force --container-runtime=containerd
             sudo: "sudo"
-          - name: vfkit-docker-macos-15-x86
+          - name: vfkit-containerd-macos-15-x86
             driver: vfkit
             os: macos-15-intel
-            start_flags: --network vmnet-shared --force
+            start_flags: --network vmnet-shared --force --container-runtime=containerd
             sudo: "sudo"
-          - name: docker-docker-ubuntu-24.04-x86
+          - name: docker-containerd-ubuntu-24.04-x86
             driver: docker
             os: ubuntu-24.04
-            start_flags: ""
+            start_flags: --container-runtime=containerd
             sudo: ""
-          - name: docker-docker-ubuntu-24.04-arm
+          - name: docker-containerd-ubuntu-24.04-arm
             driver: docker
             os: ubuntu-24.04-arm
-            start_flags: ""
+            start_flags: --container-runtime=containerd
             sudo: ""
     steps:
       - id: info-block