update hack/generate-kind-config.sh to handle multiple mirrors (#5977)

.travis.yml

@@ -91,18 +91,26 @@ jobs:
           - C:\\Users\\travis\\AppData\\Local\\go-build
     - name: "kind integration partition 0"
       <<: *integration_test
+      <<: *upgrade_docker
+      <<: *registry_mirror
       script:
         - env IT_PARTITION=0 make integration-in-kind
     - name: "kind integration partition 1"
       <<: *integration_test
+      <<: *upgrade_docker
+      <<: *registry_mirror
       script:
         - env IT_PARTITION=1 make integration-in-kind
     - name: "kind integration partition 2"
       <<: *integration_test
+      <<: *upgrade_docker
+      <<: *registry_mirror
       script:
         - env IT_PARTITION=2 make integration-in-kind
     - name: "kind integration partition 3"
       <<: *integration_test
+      <<: *upgrade_docker
+      <<: *registry_mirror
       script:
         - env IT_PARTITION=3 make integration-in-kind
     - name: "k3d integration partition 0"

hack/generate-kind-config.sh

@@ -15,4 +15,4 @@
 # limitations under the License.
 
 # Create a kind configuration to use the docker daemon's configured registry-mirrors.
-docker system info --format '{{printf "apiVersion: kind.x-k8s.io/v1alpha4\nkind: Cluster\ncontainerdConfigPatches:\n"}}{{range $reg, $config := .RegistryConfig.IndexConfigs}}{{if $config.Mirrors}}{{printf "- |-\n  [plugins.\"io.containerd.grpc.v1.cri\".registry.mirrors.\"%s\"]\n    endpoint = %q\n" $reg $config.Mirrors}}{{end}}{{end}}'
+docker system info --format '{{printf "apiVersion: kind.x-k8s.io/v1alpha4\nkind: Cluster\ncontainerdConfigPatches:\n"}}{{range $reg, $config := .RegistryConfig.IndexConfigs}}{{if $config.Mirrors}}{{printf "- |-\n  [plugins.\"io.containerd.grpc.v1.cri\".registry.mirrors.\"%s\"]\n    endpoint = [" $reg}}{{range $index, $mirror := $config.Mirrors}}{{if $index}},{{end}}{{printf "%q" $mirror}}{{end}}{{printf "]\n"}}{{end}}{{end}}'