CI: add back shim v1 test

We are going to deprecate shim v1 (#4365), but it is still early to
disable the tests for them

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

.github/workflows/ci.yml

@@ -324,11 +324,13 @@ jobs:
 
     strategy:
       matrix:
-        runtime: [io.containerd.runc.v1, io.containerd.runc.v2]
+        runtime: [io.containerd.runtime.v1.linux, io.containerd.runc.v1, io.containerd.runc.v2]
         runc: [runc, crun]
         exclude:
           - runtime: io.containerd.runc.v1
             runc: crun
+          - runtime: io.containerd.runtime.v1.linux
+            runc: crun
 
     steps:
       - name: Install Go